How Many Galaxies Are There? - [] CLT Livre

How Many Galaxies Are There?

How Many Galaxies Are There

How many galaxies are in our universe?

What is the largest galaxy in the Universe? – The largest galaxy in the Universe is likely the ESO 383-76 supergiant elliptical galaxy, It measures 1,764,000 light-years in diameter and is found in the Centaurus Constellation, some 654 million light-years from Earth.

It is difficult to know what is the largest galaxy in the Universe, however, as we’re constantly learning more about space every day thanks to new technologies including the telescope. As such, many different galaxies have been claimed to be the largest in the Universe, including the IC 1101 and Alcyoneus galaxies.

The largest known spiral galaxy is the UGC 2885, meanwhile. When you get to the largest barred spiral galaxy in the Universe, you find the NGC 6872 (the Condor Galaxy). It’s 522,000 light-years across from one point to another, which makes it over five times the size of the Milky Way.

How many Milky Way galaxies are there in space?

What is a galaxy, anyway? Our galaxy is a gravitationally bound collection of stars, swirling in a spiral through space. Based on the deepest images obtained so far, it’s one of about 2 trillion galaxies in the observable universe.

How many solar systems are in a galaxy?

How many solar systems are there? – The latest data collected by NASA indicates that there are 3,916 solar systems within our Milky Way. This means there are 3,916 stars with planets orbiting them in our single galaxy. Also according to the latest data, there are 5,241 confirmed exoplanets, which are planets that exist outside our solar system. Source: Getty Images

Are there 12 galaxies?

This article is about the astronomical structure. For Earth’s galaxy, see Milky Way, For other uses, see Galaxy (disambiguation), A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity, The word is derived from the Greek galaxias ( γαλαξίας ), literally ‘milky’, a reference to the Milky Way galaxy that contains the Solar System,

  1. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy’s center of mass,
  2. Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae.

Supermassive black holes are a common feature at the centres of galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular, Many are thought to have supermassive black holes at their centers. The Milky Way’s central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun,

It is estimated that there are roughly 200 billion galaxies ( 2 × 10 11 ) in the observable universe, Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years ) and are separated by distances on the order of millions of parsecs (or megaparsecs). For comparison, the Milky Way has a diameter of at least 26,800 parsecs (87,400 ly) and is separated from the Andromeda Galaxy (with diameter of about 152,000 ly), its nearest large neighbor, by 780,000 parsecs (2.5 million ly.) The space between galaxies is filled with a tenuous gas (the intergalactic medium ) with an average density of less than one atom per cubic meter.

Most galaxies are gravitationally organized into groups, clusters and superclusters, The Milky Way is part of the Local Group, which it dominates along with the Andromeda Galaxy, The group is part of the Virgo Supercluster, At the largest scale, these associations are generally arranged into sheets and filaments surrounded by immense voids,

Are there 2 trillion galaxies in the universe?

How many galaxies are there in the universe? How many galaxies are there in the Universe, and is this even something that we can calculate? Simplistically, the number of galaxies in the universe will be the size of the Universe times the average number density of, The James Webb Space Telescope found the oldest galaxies ever seen, GLASS-z13, 13.4 billion lightyears away. Credits: GLASS-z13 (Naidu et al.2022. Castellano et al.2022 It is estimated that the ‘observable universe’ is a sphere with a diameter of about 92 billion lightyears and a volume of about 410 nonillion (410 thousand billion billion billion) cubic lightyears! Estimating the number density of galaxies presents its own problems. A medium-deep wide-field image showing thousands of galaxies, captured by the James Webb Space Telescope. This technique will, however, give you a lower limit to the number of galaxies. One such estimate says that there are between 100 and 200 billion galaxies in the observable universe.

Which is the largest galaxy?

Giant radio galaxy Alcyoneus is now the largest known galaxy in the Universe. Move over, IC 1101. You may be impressively large, but you never stood a chance against the largest known galaxy: Alcyoneus.

How big is the biggest galaxy?

What does “big” mean in space? – Space is all about large distances and objects. Earth is big to us, about 24,901 miles (40,075 kilometers) in circumference at the equator. But based on the cosmic scheme of things, Earth is tiny. Even in our own solar system, we are easily dwarfed by the planet Jupiter (which could fit more than 1,300 Earths inside) and our sun (which could fit more than a million Earths inside of it).

And while our sun seems huge, it looks puny compared to the biggest stars we know of. The sun is a G-type star or a yellow dwarf and a pretty average size on the cosmic scale. Some “hypergiant” stars are much, much larger. Perhaps the biggest star known is UY Scuti, which could fit more than 1,700 of our suns.

(Some estimates for the size of UY Scuti put it lower on the list, but there are other gigantic stars of a similar size.) But while in diameter and circumference UY Scuti is enormous, it’s only about 30 times more massive than our sun: volume and mass don’t necessarily correlate in space.

  1. Related : Smallest, densest white dwarf ever discovered packs the sun’s mass into a moon-size stellar corpse Even more massive objects to consider are black holes and, in particular, the supermassive black holes that typically reside in the center of a galaxy.
  2. For example, the Milky Way hosts one that is about 4 million times the mass of the sun.

One of the biggest supermassive black holes ever found resides in NGC 4889 and contains 21 billion times the mass of the sun. However, even the most massive black holes aren’t particularly large, since this type of structure is the densest in the universe.

  • Nebulas, or vast clouds of gas that often condense to become new stars, also have impressively large sizes.
  • NGC 604 in the Triangulum Galaxy is commonly cited as one of the largest; it’s roughly 1,520 light-years across.
  • Galaxies are collections of star systems and everything inside those systems: black holes, planets, stars, asteroids, comets, gas, dust and more.

Our own Milky Way, if considered as one object, is about 100,000 light-years across. Scientists struggle to characterize the largest galaxies, because they don’t really have precise boundaries, but the largest galaxies we know of are millions of light-years across.

The biggest known galaxy, first described in a 1990 study from the journal Science, is IC 1101, which stretches as wide as 4 million light-years across, according to NASA, Galaxies are often bound to each other gravitationally in groups that are called galaxy clusters, (The Milky Way, for example, is part of the small Local Group that comprises about two dozen galaxies, including the Andromeda Galaxy.) Astronomers once thought that these structures were the biggest things out there.

In the 1980s, however, scientists realized that groups of galaxy clusters can also be connected by gravity, forming a supercluster, the largest class of objects in the universe.

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How many universes are in space?

Arguments against the multiverse theory – Falsifiability There is no way for us to ever test theories of the multiverse. We will never see beyond the observable universe, so if there is no way to disprove the theories, should they even be given credence? Occam’s razor Sometimes, the simplest ideas are the best.

Will I exist again if time is infinite?

Big crunch & Big bounce: The answer is yes. If there is infinite amount of universes in series, there is a probability of 1 for anything to happen again (in bounds of physical laws), which includes you.

Is time Finite or infinite?

Is time finite or infinite? As far as we can tell, the four-dimensional space-time continuum is unbounded in the space directions (space is infinite) the time dimension seems to have a singularity (about 13.8 billion years before now) and so it is impossible to talk in a sensible way about events before that time.

We would normally say that the universe and time itself started at that point, and so any statement about “before the big bang” is completely meaningless. There are other possibilities, such as “eternal inflation”, but they are rather speculative, with little positive evidence. In the other direction, into the future, time seems to be unbounded, though this is less certain, it depends very precisely on several cosmological parameters, whose values are not yet certainly known.

So our current best hypothesis is that time is finite into the past, but infinite into the future. Energy is locally conserved within the universe, but don’t apply such reasoning to the formation of the universe. Indeed the whole concept of physics ceases to operate at that singularity.

  • The basis of nature as cause-and-effect cannot operate at a singularity.
  • If space is indeed infinite, and the universe is homogenous and isotropic, then the total mass-energy of the universe could be infinite.
  • However the potential gravitational energy might be negative infinite, and so the total energy of the universe might be zero, leading to Hawking’s observation that “the universe is the ultimate free lunch”.

: Is time finite or infinite?

Is anything truly infinite?

So the conclusion is: science (that is, physics) cannot establish existence of infinite quantities. There is nothing physically infinite.

What is bigger than a galaxy?

The Universe is the biggest when compared to a galaxy or the Solar System.

What is our universe called?

Hint: Everything that we are able to see around us forms a part of the universe. Our universe consists of various stars, galaxies, Nebula, black holes, planets, etc. All the matter that we are able to observe with the help of telescopes also forms a part of our universe.

Complete step-by-step answer: Universe is a name given to all the matter around us. Our universe is also called the cosmos. It is originally a greek word. In early days it was thought that our Galaxy constituted the entire universe. Now we now know the information that we live on planet Earth, which forms a part of the Solar system created by the gravitational pull of our sun and our Sun forms a tiny part of our Milky way galaxy.

This galaxy is just one of billions which form a part of our universe. The need to understand the universe or cosmos around us gave rise to a critical field of science called cosmology. Additional Information: A few theories suggest that our universe might not be the only universe.

There might be multiple universes often called multiverses. Note: When we talk of the universe, we often talk about the ‘observable’ universe. As the Big Bang happened 13.9 billion years ago, we are only able to observe the universe to the time after the big bang. This is so because light takes some time to travel from its source to us.

If a celestial object is present at a distance of 10 Light year from us then light emitted by it 10 years ago is seen by us today. Therefore as we observe our universe, we observe it back in time and there is a limit to our observations because the galaxies/stars tend to move farther and farther apart.

Is our galaxy moving?

To begin with, Earth is rotating on its axis at the familiar rate of one revolution per day. For those of us living at Earth’s midlatitudes – including the United States, Europe, and Japan – the rate is almost a thousand miles an hour. The rate is higher at the equator and lower at the poles.

  • In addition to this daily rotation, Earth orbits the Sun at an average speed of 67,000 mph, or 18.5 miles a second.
  • Perhaps that seems a bit sluggish – after all, Mars Pathfinder journeyed to Mars at nearly 75,000 miles per hour.
  • Buckle your seat belts, friends.
  • The Sun, Earth, and the entire solar system also are in motion, orbiting the center of the Milky Way at a blazing 140 miles a second.

Even at this great speed, though, our planetary neighborhood still takes about 200 million years to make one complete orbit – a testament to the vast size of our home galaxy. Dizzy yet? Well hold on. The Milky Way itself is moving through the vastness of intergalactic space.

Is the galaxy too big to exist?

Media release – From: Swinburne University of Technology An international team, led by a Swinburne University of Technology researcher, has discovered the seemingly impossible. Using the powerful James Webb Space Telescope, they have observed massive candidate galaxies at the beginning of time, up to 100 billion times the mass of the Sun which, if confirmed, would contain more mass than was thought to exist in the whole Universe at that time.

  1. The research, published today in Nature, could upend our model of the Universe and force a drastic rethink of how the first galaxies formed after the Big Bang.
  2. We’ve never observed galaxies of this colossal size, this early on after the Big Bang,” says lead researcher Associate Professor Ivo Labbé from Swinburne University of Technology.

“The six galaxies we found are more than 12 billion years old, only 500 to 700 million years after the Big Bang, reaching sizes up to 100 billion times the mass of our sun. This is too big to even exist within current models. “This discovery could transform our understanding of how the earliest galaxies in our Universe formed.” Follow up measurements are being carried out to confirm the galaxies and rule out alternative explanations.

  • One alternative, equally fascinating, is that some of the objects belong to a new class of emerging supermassive black holes, never seen before,” Associate Professor Labbé says.
  • The power of the James Webb Space Telescope The galaxies were identified using some of the first observations from the USD$10 billion James Webb Space Telescope, the game-changing telescope which was launched in December 2021 and has been in operation since July 2022.

Associate Professor Labbé is one of two Swinburne researchers leading projects awarded precious time in JWST’s first observation cycle, alongside Distinguished Professor Karl Glazebrook. “The James Webb Space Telescope has been a revolution in astronomy, allowing us to see back to the beginning of time.

This initial discovery may just be the start of a transformation in how we make sense of the world around us,” Associate Professor Labbé says. The research was based on some of the first images taken by JWST in July 2022, as part of the Early Science Release Program CEERS, with imaging processing by Dr Gabriel Brammer (Niels Bohr Institute’s Cosmic Dawn Center at the University of Copenhagen).

The research, A population of red candidate massive galaxies ~600 Myr after the Big Bang, was published in Nature on 22 February 2023.

Which galaxy is Earth in?

Well, Earth is located in the universe in the Virgo Supercluster of galaxies. A supercluster is a group of galaxies held together by gravity. Within this supercluster we are in a smaller group of galaxies called the Local Group. Earth is in the second largest galaxy of the Local Group – a galaxy called the Milky Way.

The Milky Way is a large spiral galaxy. Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy. Here we are part of the Solar System – a group of eight planets, as well as numerous comets and asteroids and dwarf planets which orbit the Sun.

We are the third planet from the Sun in the Solar System.

What is our galaxy name?

Advanced Basic

The band of the Milky Way galaxy can be seen at night in areas with dark skies. Here it is seen with several Atacama Large Millimeter/submillimeter Arra (ALMA) antenna. (Credit: ESO/ B. Tafreshi Our Sun (a star) and all the planets around it are part of a galaxy known as the Milky Way Galaxy.

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Tell me more about galaxies

It is very difficult to count the number of stars in the Milky Way from our position inside the galaxy. Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars. These stars form a large disk whose diameter is about 100,000 light years.

Read a NASA Blueshift blog post about how many stars there are in the Milky Way

We can only take pictures of the Milky Way from inside the galaxy, which means we don’t have an image of the Milky Way as a whole. Why do we think it is a barred spiral galaxy, then? There are several clues. The first clue to the shape of the Milky Way comes from the bright band of stars that stretches across the sky (and, as mentioned above, is how the Milky Way got its name).

This band of stars can be seen with the naked eye in places with dark night skies. That band comes from seeing the disk of stars that forms the Milky Way from inside the disk, and tells us that our galaxy is basically flat. Several different telescopes, both on the ground and in space, have taken images of the disk of the Milky Way by taking a series of pictures in different directions – a bit like taking a panoramic picture with your camera or phone.

The concentration of stars in a band adds to the evidence that the Milky Way is a spiral galaxy. If we lived in an elliptical galaxy, we would see the stars of our galaxy spread out all around the sky, not in a single band. An all-sky image shows the flat plane of the Milky Way galaxy. (Credit: E.L. Wright/UCLA, The COBE Project, DIRBE, NASA) Another clue comes when astronomers map young, bright stars and clouds of ionized hydrogen in the Milky Way’s disk. These clouds, called HII regions, are ionized by young, hot stars and are basically free protons and electrons.

These are both important marker of spiral arms in other spiral galaxies we see, so mapping them in our own galaxy can give a clue about the spiral nature of the Milky Way. There are bright enough that we can see them through the disk of our galaxy, except where the region at the center of our galaxy gets in the way.

There has been some debate over the years as to whether the Milky Way has two spiral arms or four. The latest data shows that it has four arms, as shown in the artist’s illustration below. Since we can’t get outside the Milky Way, we have to rely on markers of spiral arms like young, massive stars and ionized clouds. This artist’s conception of the Milky Way’s spiral structure is based on the measured distances of young, hot stars (shown in red) and ionized clouds of hydrogen gas (shown in blue).

(Credit: Credit: Urquhart JS, et al.; Robert Hurt, the Spitzer Science Center; Robert Benjamin) Additional clues to the spiral nature of the Milky Way come from a variety of other properties. Astronomers measure the amount of dust in the Milky Way and the dominant colors of the light we see, and they match those we find in other typical spiral galaxies.

All of this adds up to give us a picture of the Milky Way, even though we can’t get outside to see the whole thing. There are billions of other galaxies in the Universe. Only three galaxies outside our own Milky Way Galaxy can be seen without a telescope, and appear as fuzzy patches in the sky with the naked eye.

The closest galaxies that we can see without a telescope are the Large and Small Magellanic Clouds. These satellite galaxies of the Milky Way can be seen from the southern hemisphere. Even they are about 160,000 light years from us. The Andromeda Galaxy is a larger galaxy that can be seen from the northern hemisphere (with good eyesight and a very dark sky).

It is about 2.5 million light years away from us, but its getting closer, and researchers predict that in about 4 billion years it will collide with the Milky Way., i.e., it takes light 2.5 million years to reach us from one of our “nearby” galaxies. Our nearest large neighbor galaxy is the Andromeda galaxy. (Credit: Bill Schoening, Vanessa Harvey/REU program/NOAO/AURA/NSF) Updated: December 2015

Can galaxies have 2 black holes?

Astronomers have discovered a cosmic smash-up just waiting to happen in a giant object just 3 billion years after the Big Bang, A galaxy called J0749+2255 actually consists of two galaxies merging into one, and it has not one but two actively feeding supermassive black holes,

It just so happens these two black holes are on a collision course, separated by a relatively tiny distance of just 10,000 light-years. It’s not the first time we’ve seen an impending supermassive black hole collision, but J0749+2255 is a rare gem. It’s been spotted early in the Universe, and both black holes are extremely active quasars.

It’s a discovery that can help scientists work on the ongoing and vexing puzzle of how supermassive black holes grow to such tremendous sizes. “We don’t see a lot of double quasars at this early time in the Universe. And that’s why this discovery is so exciting,” says astronomer Yu-Ching Chen of the University of Illinois at Urbana-Champaign.

  • Quasars are among the brightest objects in the Universe.
  • They contain an active galactic nucleus – the center of a galaxy hosting a supermassive black hole that is actively gulping down vast amounts of material.
  • Black holes emit no light of their own that we can currently detect.
  • The massive amount of material swirling around the black hole is heated by extreme friction and gravity so that it doesn’t just shine but blazes across the vast dark gulfs of time and space.

Many early Universe galaxies are quasar galaxies, and some in the nearby Universe have two or even three quasars in their center. This occurs when galaxies collide and merge, each with its own supermassive black hole, The two black holes fall towards each other, eventually – we think – merging to form one very large supermassive black hole. A Hubble Space Telescope image of the double quasar J0749+2255. ( NASA, ESA, Yu-Ching Chen/UIUC, Hsiang-Chih Hwang/IAS, Nadia Zakamska/JHU, Yue Shen/UIUC ) But these mergers are a bit harder to spot in the early Universe. The light from J0749+2255 has traveled for more than 10 billion years to reach us; what we see of the galaxy is quite small and dim compared to the stuff that’s a lot closer to us.

At that distance, the space between supermassive black holes that are bound together by gravity is usually too small for our current instruments to see A faint variation in the light from J0749+2255 detected by the Gaia telescope suggested that there might be something more going on with the galaxy than was immediately apparent but there were multiple possible causes, of which double quasar was one.

The team had to dig a lot deeper to find out what was really happening. “The confirmation process wasn’t easy, and we needed an array of telescopes covering the spectrum from X-rays to the radio to finally confirm that this system is indeed a pair of quasars, instead of, say, two images of a gravitationally lensed quasar,” says astronomer Yue Shen of the University of Illinois.

  1. And J0749+2255 is special.
  2. Since both the black holes are quasars, they shine brightly enough to be able to distinguish.
  3. And they’re not quite close enough, yet, to be a gravitationally bound binary, meaning they have enough separation for individual resolution.
  4. Using observations from a whole slew of ground- and space-based telescopes, Chen and his colleagues analyzed the light from J0749+2255.

They determined that the two black holes will likely evolve into a gravitationally bound tight binary in around 220 million years or so. The decaying orbit of this binary will eventually lead to a collision and merger into an even more massive black hole.

(They’ve probably collided by now, but that event is meaningless to us in the here and now; this is why astronomers make such predictions in the present tense.) Researchers also found that the two black holes are relative chonkers, clocking in at around 1.26 billion solar masses and 1.58 billion solar masses, respectively.

These findings could start to tell us something about the rate of binary supermassive black holes in the early Universe – which would help astronomers understand the evolution of recent black holes that can be many billions of solar masses in size, There’s still much more to uncover, but J0749+2255 represents a significant step forward.

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Can galaxies have 2 stars?

Binary Stars – The variety seen in double-star systems is nearly as rich as the galaxy’s stellar population as a whole. These pairs can differ significantly in mass, with, say, a mid-sized yellow star like our Sun locked in an orbital embrace with a far smaller, cooler red dwarf.

  1. Some binary partners evolve rapidly into red giant or supergiant stars, while their small companions remain stable.
  2. Binary systems also can host orbiting planets that have two stars in their skies, as on the fictional Tatooine in the Star Wars movies.
  3. And from our viewpoint on Earth, some binary stars stage their own eclipses.

Eclipses are scientifically valuable because observing changes in light as one star passes in front of the other can reveal their masses, diameters, precise orbits, and even compositions. Pairs of neutron stars can spiral together and collide, producing some of the universe’s heavy elements, like gold, platinum, and iodine.

Two stars orbit each other within an enormous dusty disk in the U Monocerotis system, illustrated here. When the stars are farthest from each other, they funnel material from the disk’s inner edge. At this time, the primary star is slightly obscured by the disk from our perspective. The primary star, a yellow supergiant, expands and contracts.

The smaller secondary star is thought to maintain its own disk of material, which likely powers an outflow of gas that emits X-rays. Credit: NASA’s Goddard Space Flight Center/Chris Smith (USRA/GESTAR) X-ray Binaries

Did we ever see 2 galaxies collide?

A spectacular head-on collision between two galaxies fueled the unusual triangular-shaped star-birthing frenzy, as captured in a new image from NASA’s Hubble Space Telescope. The interacting galaxy duo is collectively called Arp 143.

What comes after galaxy?

The galaxy that contains the Earth and its solar system is called the Milky Way. Solar systems orbit around their galaxies just as planets orbit around their suns. The Universe is the largest. All things, including galaxies and solar systems, are included within the Universe.

How many universes are in space?

Arguments against the multiverse theory – Falsifiability There is no way for us to ever test theories of the multiverse. We will never see beyond the observable universe, so if there is no way to disprove the theories, should they even be given credence? Occam’s razor Sometimes, the simplest ideas are the best.

Are there infinite galaxies?

2016 : WHAT DO YOU CONSIDER THE MOST INTERESTING RECENT NEWS? WHAT MAKES IT IMPORTANT? Many cosmologists now think our spatial universe is infinite. That’s news. It was only this year that I heard about it. I don’t get out as much as I used to. Thirty years ago it was widely believed that our spatial universe is the finite 3D hypersurface of a 4D hypersphere—analogous to being the finite 2D surface of a 3D sphere.

  1. Our underlying hypersphere was supposedly born, and began expanding, at the Big Bang.
  2. And eventually our hypersphere was to run out of momentum and collapse back into a Big Crunch—which might possibly serve as the seed for a new Big Bang.
  3. No yawning void of infinity, and no real necessity for a troublesome initial point in time.

Our own Big Bang itself may have been seeded by a prior Big Crunch. Indeed, we could imagine an endless pearl-string of successive hyperspherical universes. A tidy theory. But then experimental cosmologists found ways to estimate the curvature of our space, and it seems to be flat, like an endless plane, not curved like the hypersurface of a hypersphere.

  • At most, our space might be “negatively curved,” like an endless hyperbolic saddle shape, but then it’s probably infinite as well.
  • If you’re afraid of infinity, you might say something like this: “So, okay, maybe we’re in a vast infinite space, but it’s mostly empty.
  • Our universe is just a finite number of galaxies rushing away from each other inside this empty infinite space—like a solitary skyrocket exploding and sending out a doomed shower of sparks.” But many cosmologists say, no, there are an infinite number of galaxies in our infinite space.

Where did all those galaxies come from? The merry cosmologists deploy a slick argument involving the relativity of simultaneity and the inflationary theory of cosmic inflation—and they conclude that, in the past, there was a Big Bang explosion at every single point of our infinite space.

  • Flaaash! An infinite space with infinitely many galaxies! Note that I’m not talking about some shoddy “many universes” theory here.
  • I hate those things.
  • I’m talking about our good old planets-and-suns single universe.
  • And they’re telling us it goes on forever in space, and on forever into the future, and it has infinitely many worlds.

We aren’t ever going to see more than a few of these planets, but it’s nice to know they’re out there. So, okay, how does this affect me in the home? You get a sense of psychic expansion if you begin thinking in terms of an infinite universe. A feeling of freedom, and perhaps a feeling that whatever we do here does not, ultimately, matter that much.

You’d do best to take this in a “relax” kind of way, rather than in an “it’s all pointless” kind of way. Our infinite universe’s inhabited planets are like dandelion flowers in an endless meadow. Each of them is beautiful and to be cherished—especially by the little critters who live on them. We cherish our Earth because we’re part of it, even though it’s nothing special.

It’s like the way you might cherish your family. It’s not unique, but it’s yours. And maybe that’s enough. I know some of you are going to want more. Well, as far as I can see, we’re living in one of those times when cosmologists have no clear idea of what’s going on.

They don’t understand the start of the cosmos, nor cosmic inflation, nor dark energy, nor dark matter. You might say they don’t know jack. Not knowing jack is a good place to be, because it means we’re ready to discover something really cool and different. Maybe next year, maybe in ten, or maybe in twenty years.

Endless free energy? Antigravity? Teleportation? Who can say. The possibilities are infinite and the future is bright. It’s good to be an infinite world. : 2016 : WHAT DO YOU CONSIDER THE MOST INTERESTING RECENT NEWS? WHAT MAKES IT IMPORTANT?

How many galaxies are there in the James Webb Telescope?

If you gaze at this image, you gaze back into deep, deep time. Thousands of galaxies imaged by the James Webb Space Telescope. Credit: NASA / ESA / CSA / Brant Robertson (UC Santa Cruz) / Ben Johnson (CfA) / Sandro Tacchella (Cambridge) / Marcia Rieke (University of Arizona) / Daniel Eisenstein (CfA) // Image processing: Alyssa Pagan (STScI) Pretty much everything you see in this image is a galaxy — an entire galaxy brimming with stars.

  1. Astronomers recently trained the profoundly powerful James Webb Space Telescope at a small section of the sky, endeavoring to find some of the universe’s most ancient objects.
  2. Just this single image, shown above and below, encompasses tens of thousands of galaxies,
  3. You’re looking at 45,000+ galaxies,” NASA tweeted.

In this deep cosmic view, you can see spiral galaxies, similar to our Milky Way, And the Webb telescope, which collects bounties of light and peers through thick clouds of space dust with its specialized infrared cameras, also reveals ancient galaxies that once just appeared like faint blemishes.

  • You’re looking at 45,000+ galaxies.” “Previously, the earliest galaxies we could see just looked like little smudges.
  • And yet those smudges represent millions or even billions of stars at the beginning of the universe,” Kevin Hainline, an astronomer at the University of Arizona, said in a NASA statement,

“Now, we can see that some of them are actually extended objects with visible structure. We can see groupings of stars being born only a few hundred million years after the beginning of time.” Tweet may have been deleted Before the Webb telescope, which reached its solar system outpost about 1 million miles from Earth in early 2022, scientists had only found a few dozen galaxies younger than some 650 million years old.

  1. Now, through the Webb telescope’s Advanced Deep Extragalactic Survey, or JADES, they’ve almost found a thousand.
  2. Astronomers also peered at another population of stars born some 500 to 850 million years after the universe’s Big Bang event.
  3. Those early galaxies, it turns out, were vigorous star factories.

“These early galaxies were very good at creating hot, massive stars,” Ryan Endsley, an astronomer at the University of Texas at Austin, said in a statement. How many galaxies can you count? Credit: NASA / ESA / CSA / Brant Robertson (UC Santa Cruz) / Ben Johnson (CfA) / Sandro Tacchella (Cambridge) / Marcia Rieke (University of Arizona) / Daniel Eisenstein (CfA) // Image processing: Alyssa Pagan (STScI)