In this week's questions show, I explain why I don't think we always need to be realistic, if galaxies in the local group are bound together gravitationally, and what we should call Earth-moving equipment on Mars.
00:20 Be realistic.
04:24 Are galaxies in the local group bound?
05:56 Will gravitational waves give us advanced notice of collisions?
08:36 Will we ever be able to live outside on Mars?
10:16 Are we going to ruin Mars too?
12:42 Mars-moving equipment?
14:07 Could the Moon have an atmosphere?
15:51 Liquid water on the surface of Mars
16:49 Is there a business case for Mars?
19:17 What about nitrogen?
21:21 What will need to come from Earth?
23:06 Are there planets with less gravity than Earth?
Want to be part of the questions show? Ask a short question on any video on my channel. I gather a bunch up each week, and answer them here.
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