Which is the correct order from largest to smallest?

Which do most astronomers believe to be true about the universe?

Spectroscopic analysis reveals the elements that those stars contain. What do such studies help astronomers to understand better in our solar system?

What does it mean to say that we see a star that is 30 light-years away?

A galaxy with very little dust, does not make new stars, rotates very slow, and has a spheric shape...

A spherical collection of stars orbiting in a much larger galaxy; middle of the sphere has a high density of stars, What is the astronomer observing?

Which are the hottest stars?

Which are the brightest stars?

What type of star is the Sun?

In which would the largest number of stars be found?

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