Episode 602: Q&A 110: Why Can't I Just Be Realistic About Mars? And More...

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 Mars16:49 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.Our Book is out!https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/Audio Podcast version:ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2RSS: https://www.universetoday.com/audioWeekly email newsletter:https://www.universetoday.com/newsletterWeekly Space Hangout:https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/Astronomy Cast:https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSgSupport us at: https://www.patreon.com/universetodayMore stories at: https://www.universetoday.com/Twitch: https://twitch.tv/fcainFollow us on Twitter: @universetodayLike us on Facebook: https://www.facebook.com/universetodayInstagram - https://instagram.com/universetodayTeam: Fraser Cain - @fcain / [email protected] Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fwChad Weber - [email protected] Universe Today Podcast