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How does redshift support the notion of the expanding universe?
The redshift of distant galaxies is believed to be a result of the Doppler effect - in other words, the light is shifted towards lower frequencies ("redshifted") due to the fact that the galaxies move away from us.
What is one way that an elliptical galaxy differs from the other types of galaxies?
Elliptical galaxies are large blob shaped galaxies that most galaxies will eventually look like. Elliptical galaxies are what happens when two or more large galaxies collide and coalesce.
Do all the galaxies form a bigger galaxy?
Over time - billions of years - galaxies will merge with other galaxies. In about 3 billion years, the Andromeda galaxy will merge with our own galaxy, the Milky Way.However, the separation between galaxies is so great, that not all galaxies will merge unless the fundamental issue of the amount of mass in the Universe is determined.If we live in a "contracting universe" then eventually all galaxies will merge.
Does Every Galaxy Merge Eventually?
The answer to this is we do not know but it looks unlikely.The expansion of the universe appears to be speeding up. Local Galaxies might merge into larger galaxies but these galaxies will expand faster and faster away from each other.
What did many astronomers believe about galaxies in the 1920s?
Among other things, that they were static in space
Is there an infinite number of galaxies in the universe?
Yes, there is believed to be an infinite number of galaxies in the universe.
How do irregular galaxies become irregular?
Irregular galaxies are believed to have been spiral or elliptical galaxies in the past, which have been distored through gravitational pull of neighboring galaxies.
Are black holes found IN the center of every galaxy?
Not all galaxies, but it is believed that the majority of galaxies have central black holes.
Who first demonstrated that there are other galaxies besides the milky way?
Edwin Powell Hubble
How does redshift support the notion of the expanding universe?
The redshift of distant galaxies is believed to be a result of the Doppler effect - in other words, the light is shifted towards lower frequencies ("redshifted") due to the fact that the galaxies move away from us.
What is tough to be at the very center of all galaxies?
Perhaps you mean "thought to be"? - It is believed that all, or most, galaxies have a supermassive black hole at their center.
Do all galaxies have black holes in the center?
Not all galaxies have black holes in their centers, but many large galaxies, including our own Milky Way, are believed to have supermassive black holes at their centers.
Can two galaxies combine together?
Galaxies do combine or merge together. In about 4.5 -> 5.5 billion years time time, the Andromeda Galaxy will combine with our galaxy, the Milky Way Galaxy. In a lot of cases Irregular Galaxies are believed to have formed with interactions with other galaxies. See related link for a picture of two galaxies merging.
Is the milky way getting bigger?
Yes it is believed that the Milky Way is getting bigger. A galaxy can only grow if it swallows mass from outside it. Galaxies merge and are absorbed by other galaxies in a process known as Galactic Cannibalism. It is currently believed that a dwarf Galaxy known as the Sagittarius Dwarf is being slowly swallowed by the Milky Way.
How may galaxies are there in the universe?
There are several hundred billion galaxies in the KNOWN (or observable) Universe; the actual Universe, however, is believed to be much, much bigger.
Are some galaxies very small and have only a few thousand stars?
These small galaxies are believed to be the result of collisions between larger spiral galaxies. During such collisions pieces of the spiral arms get flung out into space, becoming small irregular galaxies.
What cosmic accident is believed to form many irregularly shaped galaxies?
Collisions or interactions between galaxies are believed to be the cosmic accidents that can lead to the formation of many irregularly shaped galaxies. These interactions can trigger bursts of star formation and distort the shape of galaxies, resulting in the formation of irregular shapes.
