Who started to classify galaxies?

What is a galaxy?

what happens when gas in a nebula's center stops collapsing?

What are the inner planets with a rocky surface?

The center of a collapsed cloud of gas and dust is very...

what happens to the solar nebula over time?

In the solar nebula, bits of _______ collided & stuck together to form small bodies

The largest of colliding bodies in the solar system are called

Some of the largest planetismisals were far enough away to attract...

which planets are big balls of gases?

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