Episode 579: Q&A 103: How Many Stars Have Zero Planets? And More...

In this week's questions show, I explain why we'll never know which stars have no planets. How we could prevent a catastrophe to Earth, and why aliens might still be a threat to us.Check out more of Dustin Gibson's photographs at:https://www.instagram.com/gibsonpics/00:48 How many stars don't have planets?02:29 Could we prevent a catastrophe?05:16 No aliens would be a threat to us07:38 Can I have any name for Patreon?08:20 Why not put a laser on the solar sail spacecraft09:40 How can neutrinos go faster than light?10:45 How do you calculate exposure times for Hubble?14:32 What would cause stars to collide17:19 Why don't we track asteroids?18:55 How do magnetars form?20:36 How could we destroy the planet?22:45 Can a brown dwarf become a star?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/audioWhat Fraser's Watching Playlist:https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1GWeekly 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