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Activity on Planets Suggests Youth

Can these processes really have gone on for billions of years?

Solar System Theories Challenged

"Everything we know about the formation of solar systems might be wrong," say two astronomers who discovered something "very bizarre."

Moon Origin Models Require Cheating

You can't get Earth's moon from a planetary collision without quasi-miraculous tweaks to the models.

Solar System Reversals

The planets keep going around, but theories about them often stop and go backward or sideways. When nothing else works, send in the impactors!
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