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They thought that the milky way galaxy included every other object in space.
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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.
What did many astronomers about galaxies prior to the 1920's?
The Milky Way, included every object in space
How many galaxies do astronomers believe there are?
Billions. (rounded)
What did many astronomers believe about galaxies in the 1920s?
Among other things, that they were static in space
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.
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.
How many galaxies are there in a typical cluster of galaxies?
Galaxy clusters typically have anywhere from 50 to 1,000 galaxies.
How many galaxies are spiral?
Approximately 60% of all galaxies are spiral
What might the center of a rotating spiral galaxy contain?
It is believed that there are black holes in the centers of many galaxies. I believe a super-massive black hole
How are the centers of many spiral galaxies similar to many elliptical galaxies?
Both have a huge black hole at their center.
How many barred spiral galaxies there?
It's not known to any degree of accuracy, but about 66% of all spiral galaxies are barred and about 60% of galaxies in the local Universe are spiral galaxies.
The scientist who proved the existence of galaxies other than the Milky Way was who?
Mister Edwin Hubble did just that, before the 1920's, many astronomers thought that our galaxy included everyobject in space, in 1924 Edwin Hubble proved that other galaxies existed beyond the milky way
