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A comet doesn't have a tail except when it's near a star.

Oh, and I knew as soon as an asteroid was mentioned, that it would turn out to be a comet that they got water from.

Actually, I figured they would get water somehow like that, but as soon as they mentioned an asteroid, I knew it would be this episode.

They're trying to "jump start" some kind of atomic engines, and the KEYBOARD sparks?!?!?

And if they're supposed to colonize a new planet, why wouldn't they have any explosives?

Lots of the physics are still a mess, of course. "Gravity" in areas that aren't rotating, etc. Using the shuttle to turn the Ark, once in motion it would have to "pull" the other direction to stop the turn...

Blah blah blah.

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Oh, and looking for nearby systems to get water?

Proxima Centauri is THE CLOSEST star to Earth. A little over 4 light-years. Barnard's Star is next closest, just under 6 light-years, but in a very different direction!

There are NO CLOSER SYSTEMS TO EARTH than Proxima.

Period.

Actually, WISE 1049-5319 is closer to Proxima, about 2 light-years beyond on a course from Earth. But they would get to Proxima FIRST.

And let's not even start on how unlikely they would be to encounter a comet that far out.

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