Likely, no logical explanation for the Moon breaking orbit then traveling light speed into other star systems / why they keep encountering life in open interstellar space, could be realized.
I was forgiving of those flaws during the first incarnation because
it was fun regardless and I was a scifi fan but it wouldn't wash with me, today.
In the original, there wasn't really supposed to be a logical explanation. The recurring theme of the first season was that space was a mysterious, surreal realm where human assumptions and rules broke down and anything was possible.
It was sort of akin to Lem's
Solaris in its philosophy that the universe was fundamentally unknowable, that any human attempt to impose logic on it was merely a reflection of our own preconceptions and limits. There was also an element of Homer's
Odyssey in it, sort of a mythic quest narrative. If you approach it more as a surrealist fantasy or space-age myth than an SF show, it works better, at least in season 1. Season 2 abandoned all the more philosophical stuff to make it more American-friendly, so it became a lot more shallow and dumb.