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 us 07:38 Can I have any name for Patreon? 08:20 Why not put a laser on the solar sail spacecraft 09:40 How can neutrinos go faster than light? 10:45 How do you calculate exposure times for Hubble? 14:32 What would cause stars to collide 17:19 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=2 RSS: https://www.universetoday.com/audio What Fraser's Watching Playlist: https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G 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