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We theorize that all galaxies form from the gravitational contraction of gas clouds (like stars, but...

We theorize that all galaxies form from the gravitational contraction of gas clouds (like stars, but on a larger scale). If galaxies form in this way, which one must be true about galaxies?

a) Galaxies will never cluster together.

b) Low-mass galaxies are more numerous than high-mass galaxies.

c) Galaxies are always as large, or larger than the Milky Way.

d) Most galaxies must be irregular galaxies.

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Answer #1

a) Though galaxies are expanding and moving away from each other, it is still found that they collide and form clusters. So the statement that galaxies will never cluster together is a wrong a statement.

b) It's true that low-mass galaxies are the most numerous galaxy type, though their origin and properties remain largely unknown.

c) No. Not all galaxies are large, or larger than Milky way. The Andromeda galaxy is not bigger than Milky way.

d) Spiral galaxies are the most common type of galaxies among the three types of galaxies - spiral, elliptical and irregular. So, statement that most galaxies must be irregular is wrong.

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