NattyBumppo

Note: it's darrellgwynnfoundation.org, not darrylgwynnfoundation.org. You should fix your post.

Note that Lagrangian points are found by simple orbital mechanics; finding them isn't the problem. The problem is sending stuff there.

What's the usual process like for creating an episode, from start to finish?

You realize Curiosity wasn't the first rover to land on Mars, right?

Certifications? At best, you'd have to pass the JLPT, which shouldn't be very hard for someone at your level. You wouldn't need to study abroad in Japan to be a professional subtitler; this isn't a requirement at all.

Trust me; I've done professional translation for several years and am friends with subtitlers and text translators in the Japanese entertainment industry. You could go legit and actually do this full-time.