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Going to Mars won't save us from a gamma ray burst either. Not sure what you mean by red dwarf but I take it that you mean an event on the scale of a gamma ray burst. Mars ain't good enough for that.

I'd be curious to hear about events which would wipe out Earth and the moon but leave Mars intact.

By red dwarf I believe the GP means later phases of the star cycle when the sun increases in size and intensity.

That's hundreds of millions of years into the future. It's further away from us than the dinosaurs. Even if we never went to Mars (which we absolutely should), it would have been a major achievement had we survived for so long.

I thought the moon had minerals, everything you need to grow an independent colony. I'm not sure saying it only has H3 is entirely accurate.

I think you meant Helium-3 instead of H₃ (an ion mostly found in gas clouds in space) or Hydrogen-3 (an isotope with a half life of a decade or so).

I did -- thankyou. He3.