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The Milky Way, included every object in space
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What did many astronomers believe about galaxies in the 1920s?
Among other things, that they were static in space
How many galaxies do astronomers believe there are?
Billions. (rounded)
Will astronomers measure redshifts of 100 billion galaxies in the observable universe?
No. We do not have time to make so many measurements.
What type of scientist studies the Solar System stars and galaxies?
Collectively they are called Astronomers and Astrophysicists. Either professionals or amateurs.There are many types of astronomers, defined by how they study the stars. The most well-known are those that use optical telescopes followed closely by those that use Radio-telescope to pick up wavelengths other than visible light. there are many others and many other ways to collect data on the galaxies and stars.Astrophysicists are astronomers and may also collect direct data, yet they are more interested in the working behind the data. They deal in physics and theories of the galaxies.
What did many astronomers believe about galaxiesin the 1920s?
That the Milky Way is the only existing galaxy populated by millions of sun-like stars. It wasn't until Edwin Hubble's discovery of the Andromeda galaxy in 1922 that everything changed, where we, since his discovery, now know that there are billions of galaxies each containing hundreds upon billions of stars! EDIT: Now I registered! If you want to know more, feel free to contact me!
How many galaxies are there so far?
See "related links" for a list of some important ones. The Hubble Space Telescope alone has observed thousands, and that was just by looking at a very small patch of the sky. There are actually millions that could be observed if we had time to do it. In fact, astronomers calculate that there are hundreds of billions of galaxies. In theory many of them could be observed and the number we can see will increase as our technology improves.
What did many believe about galaxies prior to the 1920?
They thought that the milky way galaxy included every other object in space.
What did many astronomer's believe about galaxies prior to the 1920's?
They thought that the milky way galaxy included every other object in space.
Why might there be a black hole at the center of most galaxies?
The speed of rotation of a galaxy is related to the mass of the galaxy. Most galaxies appear to be spinning more quickly than their masses could account for, leading some scientists to believe that (many? most?) galaxies are heavier than they appear to be. So if there is a lot of extra mass that we cannot see, a black hole is a logical supposition. We can't prove it - yet - but many astronomers believe that supermassive black holes may reside in the centers of most galaxies.
Which feature of the immigration laws of the 1920s was different from prior laws?
The laws introduced a quota system.
Is there a black hole in this galaxy?
Currently, most astronomers believe there is probably a large black hole at the center of most, if not all, galaxies, including ours. There are also probably many smaller black holes scattered throughout.
How many constellations are recognized by astronomers?
88 constellations are recognized by astronomers.
