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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:
\nhttps://www.instagram.com/gibsonpics/

00:48 How many stars don't have planets?
\n02:29 Could we prevent a catastrophe?
\n05:16 No aliens would be a threat to us
\n07:38 Can I have any name for Patreon?
\n08:20 Why not put a laser on the solar sail spacecraft
\n09:40 How can neutrinos go faster than light?
\n10:45 How do you calculate exposure times for Hubble?
\n14:32 What would cause stars to collide
\n17:19 Why don't we track asteroids?
\n18:55 How do magnetars form?
\n20:36 How could we destroy the planet?
\n22:45 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!
\nhttps://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/

Audio Podcast version:
\nITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2
\nRSS: https://www.universetoday.com/audio

What Fraser's Watching Playlist:
\nhttps://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G

Weekly email newsletter:
\nhttps://www.universetoday.com/newsletter

Weekly Space Hangout:
\nhttps://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/

Astronomy Cast:
\nhttps://www.youtube.com/channel/UCUHI67dh9jEO2rvK--MdCSg

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Team: Fraser Cain - @fcain / frasercain@gmail.com
\nKarla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw
\nChad Weber - weber.chad@gmail.com

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