Ask Ethan #82: Why are the planets all in the same plane?

Ethan Siegel
Starts With A Bang!
7 min readApr 3, 2015

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The possibilities were almost limitless, so why does everything line up?

“Hope is not the conviction that something will turn out well but the certainty that something makes sense, regardless of how it turns out.” -Vaclav Havel

A number of excellent questions came my way this week, as the submissions for Ask Ethan gave me a great selection…

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Ethan Siegel
Starts With A Bang!

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.