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

Ethan Siegel
Apr 3, 2015 · 7 min read

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…