Our solar system formed about 4.6 billion years ago when

One characteristic all outer planets are similar is

What evidence proved that the solar system is approximately 4.6 billion years old?

The solar system formed from

How was early Earth different from Earth today?

The Sun is powered by

Which evidence is often used to suggest that some mass extinction of life on Earth were caused by asteroid impacts?

Early telescopes showed stars as only points of light, while the planets appeared to be much larger, providing evidence that stars must

Most of the craters left by asteroid impacts on Earth have disappeared because of

Which planet was formed from light gases of the outer solar nebula?

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