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 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. 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=2 RSS: https://www.universetoday.com/audio Weekly email newsletter: https://www.universetoday.com/newsletter Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: https://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg Support us at: https://www.patreon.com/universetoday More stories at: https://www.universetoday.com/ Twitch: https://twitch.tv/fcain Follow us on Twitter: @universetoday Like us on Facebook: https://www.facebook.com/universetoday Instagram - https://instagram.com/universetoday Team: Fraser Cain - @fcain / frasercain@gmail.com Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw Chad Weber - weber.chad@gmail.com