A: We’ve known since the early 20th century that the universe is expanding — after observations by Edwin Hubble and others showed that other galaxies are almost all moving away from us — and the greater their distance, the faster they’re doing so.
- 1 Do galaxies expand as the universe expands?
- 2 Why do galaxies not expand with the universe?
- 3 Do clusters of galaxies expand?
- 4 Why do galaxies in clusters stay together even though the universe is expanding?
- 5 Why is the universe expanding faster?
- 6 How many galaxy clusters are in the universe?
- 7 Why does the universe expand?
- 8 Do galaxies stretch?
- 9 Are galaxies moving or is space expanding?
- 10 How are clusters of galaxies spread throughout the universe?
- 11 Where does the universe expand into?
- 12 What is causing the expansion of the universe quizlet?
- 13 What happens as the universe expands?
- 14 What causes the universe to accelerate its expansion quizlet?
- 15 Is the universe expanding slower or faster?
- 16 What is the speed of the universe expansion?
- 17 Is the universe shrinking or expanding?
- 18 What’s bigger galaxy or galaxy cluster?
- 19 Do galaxy clusters move?
- 20 Why are galaxy clusters important?
- 21 Why do further galaxies move faster?
- 22 How do galaxies evolve and change over time?
- 23 How many galaxies make up the Local Group?
- 24 Are galaxies evenly distributed throughout the universe?
- 25 What if the universe isn’t expanding?
- 26 How can the universe expand if its infinite?
- 27 Is the Earth expanding Why or why not quizlet?
- 28 What would most likely caused the future acceleration of the expansion of the universe?
- 29 What are the four possible expansion patterns of the universe?
- 30 What exactly is expanding in the universe quizlet?
- 31 Why do astronomers think that the universe is expanding quizlet?
- 32 Why does the rotation curve of a spiral galaxy increase with increasing distance near the galaxy’s center?
- 33 Does a cluster move?
- 34 What happens when galaxies move apart?
- 35 What causes galaxies to collide?
- 36 Is group bigger than cluster?
- 37 What is the difference between galaxy groups and clusters?
- 38 How does gravitational lensing tell us about the mass of a galaxy cluster?
- 39 Is the galaxy or universe bigger?
- 40 What makes up the universe from smallest to largest?
- 41 Which is the largest galaxy in the universe?
Do galaxies expand as the universe expands?
A: We’ve known since the early 20th century that the universe is expanding — after observations by Edwin Hubble and others showed that other galaxies are almost all moving away from us — and the greater their distance, the faster they’re doing so.
Why do galaxies not expand with the universe?
There is enough matter in a galaxy, that the matter within the galaxy is not affected by the expansion of the universe. You can think of this as the gravity of the galaxy holding it together, but really it’s more fundamental than that.
Do clusters of galaxies expand?
The reason is that in a cluster of galaxies, the mutual gravity between the various galaxies is able to overcome the cosmic expansion and hang on together as a gravitationally bound system. Thus within the cluster, the galaxies will not be expanding away from each other.
Why do galaxies in clusters stay together even though the universe is expanding?
Second, at a local scale, gravity dominates over cosmological expansion and holds matter together. The scale at which this happens is surprisingly large – even entire clusters of galaxies resist expansion and hold together.
Why is the universe expanding faster?
Inhomogeneities in the early universe cause the formation of walls and bubbles, where the inside of a bubble has less matter than on average. According to general relativity, space is less curved than on the walls, and thus appears to have more volume and a higher expansion rate.
How many galaxy clusters are in the universe?
NARRATOR: The universe contains about 100 billion galaxies in gigantic groups called galaxy clusters. Clusters are portions of space where many galaxies, sometimes thousands, are concentrated.
Why does the universe expand?
Because this energy is a property of space itself, it would not be diluted as space expands. As more space comes into existence, more of this energy-of-space would appear. As a result, this form of energy would cause the universe to expand faster and faster.
Do galaxies stretch?
Our atoms remain the same size. So do the planets, moons, and stars, as well as the distances separating them. Even the galaxies in our Local Group aren’t expanding away from one another; they’re gravitating towards one another instead.
Are galaxies moving or is space expanding?
Space is expanding from the Big Bang and the acceleration of dark energy. But the objects embedded in space, like planets, stars, and galaxies stay exactly the same size. As space expands, it carries galaxies away from each other. From our perspective, we see galaxies moving away in every direction.
How are clusters of galaxies spread throughout the universe?
How are galaxies spread throughout the universe? Clusters of galaxies exist that are themselves often clustered into superclusters. Clusters and superclusters appear to be distributed on surfaces surrounding empty regions of space.
Where does the universe expand into?
The universe is everything, so it isn’t expanding into anything. It’s just expanding. All of the galaxies in the universe are moving away from each other, and every region of space is being stretched, but there’s no center they’re expanding from and no outer edge to expand into anything else.
What is causing the expansion of the universe quizlet?
Scientists theorize that dark energy is causing the expansion of the universe to accelerate.
What happens as the universe expands?
As the Universe expands, its volume is increasing while the energy density doesn’t change, and therefore the total energy increases. It’s as though new space is getting created due to the Universe’s expansion.
What causes the universe to accelerate its expansion quizlet?
Dark energy is the name given to whatever might be causing the expansion of the universe to accelerate.
Is the universe expanding slower or faster?
In June 2016, NASA and ESA scientists reported that the universe was found to be expanding 5% to 9% faster than thought earlier, based on studies using the Hubble Space Telescope.
What is the speed of the universe expansion?
We’ve even measured that rate precisely well, and can be certain, from all the measurements and observations we’ve taken, that the present-day rate of expansion is precisely between 66 and 74 km/s/Mpc: kilometers-per-second-per-megaparsec.
Is the universe shrinking or expanding?
It is a well-established fact that the universe is expanding. It grows without center, like an inflating raisin cake, but an infinite raisin cake filling all of space in all directions.
What’s bigger galaxy or galaxy cluster?
When comparing the two, a typical globular cluster might contain a mass of 100,000 Suns, whereas the Milky Way has nearly 1 trillion solar masses. In other words, the Milky Way Galaxy contains 10 million times more mass than a typical globular cluster.
Do galaxy clusters move?
In a galaxy far far away
The teams detected the motion of galaxy clusters that are several billion light-years away and moving at velocities of up to 600 km/s. The velocities of these distant objects are extremely difficult to detect as they require very precise distance measurements.
Why are galaxy clusters important?
Galaxy clusters are the largest gravitationally-bound structures in the universe. As such, they are powerful tracers of the structures of matter on the largest scales, allowing us to measure the properties of the universe itself.
Why do further galaxies move faster?
It took the same amount of time for all the dots to change their positions, so the more distant dots appeared to be moving faster. That’s how it works with the Universe. Because space itself is expanding, the more further a galaxy is, the faster it seems to be receding.
How do galaxies evolve and change over time?
Theory suggests that galaxies can change from spiral to lenticular when two of them collide in slow motion interactions. When two galaxies of unequal mass merge, gravitational effects pull gas to the center, sweeping away the spiral structure and leaving behind a smooth, barren disk.
How many galaxies make up the Local Group?
There are over 30 galaxies that are considered to be in the local group, and they are spread over a diameter of nearly 10 million light years, with the center of them being somewhere between the Milky Way and M31. M31 and the Milky Way are the most massive members of the Local Group, with M33 being the 3rd largest.
Are galaxies evenly distributed throughout the universe?
Galaxies and dark matter are not spread uniformly across the Universe, and instead have been concentrating, under the pull of gravity, into a weblike structure of clusters and filaments, with enormous voids in between.
What if the universe isn’t expanding?
If the Universe weren’t expanding at all, you’d be able to calculate the size of anything — atoms, the Earth, the galaxy, a group/cluster of galaxies etc. — just by understanding the physical forces at play and the dynamics of the particles/objects involved.
How can the universe expand if its infinite?
So essentially, if the universe is of infinite magnitude, it cannot possibly be expanding into anything. Rather, it’s stretching (it’s a fine distinction, but an important one). Simply put, every region of the universe, every distance between every pair of galaxies, is being “stretched,” pulled apart like taffy.
Is the Earth expanding Why or why not quizlet?
There is no firm evidence for an expanding Earth. The Earth is the ultimate “recycler”. The Earth maintains a steady volume by destroying old lithosphere at subduction zones while creating new lithosphere at midocean ridges and continental rift zones.
What would most likely caused the future acceleration of the expansion of the universe?
The most likely cause of the future acceleration expansion of the universe is the continued extension of dark energy. Explanation: 1. Dark energy is a term that describes a mysterious form of energy responsible for the large scale effects most importantly the effects on expansion of the universe.
What are the four possible expansion patterns of the universe?
#14 describe and compare the four general patterns for the expansion of the universe: recollapsing, critical, coasting and accelerating.
What exactly is expanding in the universe quizlet?
Terms in this set (10)
The space between galaxy clusters. In the expanding universe, what exactly is expanding? Hubble’s Law.
Why do astronomers think that the universe is expanding quizlet?
Why do astronomers believe the Universe is expanding? They see a redshift in the spectral lines of distant galaxies. What is the cosmic horizon? The distance beyond which astronomical objects are invisible — even in principle — because the Universe is not old enough for their light to have had time to reach us.
Why does the rotation curve of a spiral galaxy increase with increasing distance near the galaxy’s center?
Why does the rotation curve of a spiral galaxy increase with increasing distance near the galaxy’s center? The encircled mass increases so fast that gravity increases with radius. What is the evidence that there is dark matter beyond the disk of a spiral galaxy?
Does a cluster move?
few clusters are known as moving clusters because the convergence of the proper motions of their individual stars toward a “convergent point” is pronounced. The apparent convergence is caused by perspective: the cluster members are really moving as a swarm in almost parallel directions and with about the same speeds.…
What happens when galaxies move apart?
The expansion of space itself makes it appear as though galaxies are moving apart and causes the spectral lines to shift, changing their colors. The expansion of space causes galaxies to appear to be moving apart from each other.
What causes galaxies to collide?
Many large galaxies can attract a smaller galaxy. The gravity of the large galaxy will pull the smaller one towards it, creating a collision. If one galaxy has enough momentum, the galaxy with enough movement or momentum could keep moving away after the collision.
Is group bigger than cluster?
Clusters are larger than groups, although there is no sharp dividing line between the two. When observed visually, clusters appear to be collections of galaxies held together by mutual gravitational attraction.
What is the difference between galaxy groups and clusters?
A typical galaxy group has around 50 galaxies, and contains a total mass of about 10 trillion times the mass of the Sun. Galaxy clusters are even larger, and can contain up to 1000 galaxies., with a mass of 100 trillion to 1000 trillion suns.
How does gravitational lensing tell us about the mass of a galaxy cluster?
How does gravitational lensing tell us about the mass of a galaxy cluster? The lensing allows us to determine the orbital speeds of galaxies in the cluster, so that we can determine the mass of the cluster from the orbital velocity law.
Is the galaxy or universe bigger?
Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them!
What makes up the universe from smallest to largest?
From largest to smallest they are: Universe, galaxy, solar system, star, planet, moon and asteroid.
Which is the largest galaxy in the universe?
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.