Why should galaxy collisionshave been more common in the pastthan they are today? Galaxieswere closer together in the pastbecause the universe was smaller. Such galaxiesproduce somuch light that they would have consumed all their gas long ago if they had always been forming stars at this high rate. Click to see full answer
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How common were collisions between galaxies in the past?
Feb 18, 2020 · c) The universe was much denser in the past, soits galaxies weremuch closer together, making collisionsmuch more frequent. Click to see full answer. Regarding this, why are galaxy collisions common? Although galaxy collisionsare common, stars in each galaxyare so far apart that collisionsbetween stars are very rare.
Why do galaxies collide with each other?
Why should galaxy collisions have been more common in the past than they are today? Galaxies were closer together in the past because the universe was smaller. Such galaxies produce so much light that they would have consumed all their gas long ago if they had always been forming stars at this high rate.
What causes a spiral galaxy to form?
A) Galaxies were more active in the past and therefore would have collided with each other more frequently. D) Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars and light. Similarly, what are galaxy collisions? In a galaxy collision, large galaxies absorb smaller galaxies entirely, tearing them …
Are galaxies projectiles in a static universe?
Dec 17, 2019 · Why should galaxy collisions have been more common in the past than they are today? a. Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars.
Answer
it has been theorized than galaxies were a lot closer together near the beginning of the universe. collisions would have been more common due to the short distance between them. today, galaxies move away from each other and drift farther out into the vastness of space
New questions in Physics
initially the angle 0 is much less than the critical angle for this light in water the laser moves and 0 gradually increases untill it is much greater …
What is the disk component of a spiral galaxy?
Tap card to see definition 👆. -The disk component of a spiral galaxy mostly consists of the gas and the dust. The disk typically has younger stars and also have active star formation. -The halo is spherical and contains small amounts of gas and ISM.
Is the speed of the stars constant?
The speeds of the stars or gas is different than that of our solar system. The speed becomes almost constant for the stars of very large distance from the center of the galaxy. This shows that unless our understanding of gravity is wrong then some invisible matter that makes up a great portion of galaxy exists.
What is Hubble's constant?
Explain what we mean when we say that Hubble's constant is between 21 and 23 kilometers per second per million light-years. -A law that states further galaxies more away from us with greater speeds. -It means that the speed of the galaxy lies between 21 and 23 km/s for every million light years it is away form us.
Why are collisions between galaxies so common?
We expect collisions between galaxies to be relatively common (while star-star collisions are rare) because the typical distance between galaxies is comparable in scale to the size of the galaxies themselves.
Why are collisions more common in the past than today?
Galaxy collisions should have been even more common in the past than they are today because the density of galaxies was greater in the past. Since a similar number of galaxies (compared to today) existed in closer proximity to each other, they were more likely to encounter each other.
What is the study of how galaxies form and develop in our expanding universe?
Galaxy evolution is the study of how galaxies form and develop in our expanding universe. Telescopic observations allow us to observe the history of galaxies, since the farther we look into the universe, the further we can see back in time.
How is a spiral galaxy thought to form?
The starting assumptions used for models of galaxy formation are that the universe was initially filled more or less uniformly with hydrogen and helium gas and that some regions of this gas were slightly denser than others.
What are the assumptions used to model galaxy formation?
The starting assumptions used for models of galaxy formation are that the universe was initially filled more or less uniformly with hydrogen and helium gas and that some regions of this gas were slightly denser than others. The extra density in some areas increased the gravitational pull, slowing and then reversing the expansion ...
What causes a spiral galaxy to form out of gas?
The angular momentum of the original gas cloud causes the gas cloud to spin and flatten out as it collapses, gas particles collide, and the gas cools , thereby forming the disk of a spiral galaxy out of the leftover gas. (A system of stars and no gas would not form a disk.)
How do radio galaxies emit energy?
Radio galaxies can emit powerful jets of fast-moving particles that inject high amounts of kinetic energy into their surroundings. The source of the jets are from the accretion of material onto a supermassive black hole. Radio galaxies are AGN seen disk on - so that we can't directly see the center of the galaxy.
