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Nebulae or star clusters within the Milky Way Galaxy.
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∙ 10y ago
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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
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.
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.
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.
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.
Who first demonstrated that there are other galaxies besides the milky way?
Edwin Powell Hubble
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.
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.
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.
Are nebulas in elliptical galaxies?
Because of their age, elliptical galaxies are believed to have older stars and less gas and dust in their insterstellar medium than other types of galaxies, and thus their nebulae are less common. However, nebulae are presumed to exist in almost all galaxies; and some recent observations hint that the central black holes of elliptical galaxies may tend to preserve interstellar gas by preventing it from cooling enough for star formation.
Did galaxies form around super massive black holes?
It's generally believed that galaxies first formed around "ordinary" black holes and over time, they grew into super massive black holes as stars were slowly "consumed" by the black hole.
What is a galaxy with a black hole at its Center?
It is believed that all galaxies have a black hole at their centers.
