Not sure if this is more astronomy or engineering, bit of both i guess, so it might be a bit unfair, but: How realistic is Elon Musks goal to have a colony of 80,000 people on mars by 2050? Also, how many methods of detecting non-intelligent life are there? I know there are a fair few for intelligent life, such as looking for waves and signals, ect. But I imagine it must be infinitely more difficult to look for, say, bacteria. Not a quiz, just curious, but I hope it helps in some way.