On the frontier, the Kuyper Belt and binary planetesimals make the solar system a much more exciting place than it seemed in the 70s when i cared about that a lot.
Discussion/favorite space missions?
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I am not into the space mission to be honest.
I mostly just read about the properties of the planets and stelar bodies. I also like to read the theories that may explain the behavior of the universe, I have not in a couple of weeks though.