Activity on Planets Suggests Youth
November 11, 2016
Can these processes really have gone on for billions of years?
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Solar System Theories Challenged
October 25, 2016
"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
June 1, 2015
You can't get Earth's moon from a planetary collision without quasi-miraculous tweaks to the models.
Solar System Reversals
February 9, 2015
The planets keep going around, but theories about them often stop and go backward or sideways. When nothing else works, send in the impactors!