Tag Archives: sedna

Pluto’s Place in the Solar System

When New Horizons​ launched, its mission in the public imagination was to complete the set of the nine planets. No doubt this helped the mission get funded, and I respect that. By the time it arrived, though, we had accumulated … Continue reading

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What might it mean if Pluto is geologically active?

This week, we saw this on Pluto: This surface has no yet-identified impact craters in it. Instead, there are very tall mountains of unknown geology, some weird puffy deposits near the limb, obscuring underlying geology, a rille I cannot explain, … Continue reading

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