How Cold Are Moon Shadows, Why Are Dark Matter Halos Spherical, War For The Moon | Q&A 251

How cold does it get in the shadows on the Moon? What's going on with dark matter research? Can we chase Oumuamua with a solar sail spacecraft? Will we ever face a war for the Moon? Answering all these questions and more in this week's Q&A. 🦄 Support us on Patreon:   / universetoday   📚 Suggest books in the book club:   / universe-today-book-club   00:00 Start 00:29 [Andoria] How cold do shadows on the Moon get? 05:34 [Vulcan] Why are dark matter halos spherical? 08:48 [Risa] Are we alone in the Universe? 12:26 [Aeturen] Will there be a war for the Moon? 15:40 [Vendikar] Current obsessions 19:58 [Remus] What's going on with dark matter? 23:52 [Janus] Can we catch Oumuamua with a solar sail? 29:07 [Cait] What are the Hawking radiation particles? 29:52 [Betazed] What caused the Big Bang? 29:57 [Cheleb] How to transfer energy from space down to Earth? 33:49 [Nimbus] Will dark energy eventually decline? 36:44 [Belos] Is the risk of solar flares overblown or unappreciated? 📰 EMAIL NEWSLETTER Read by 70,000 people every Friday. Written by Fraser. No ads. Subscribe for FREE: https://universetoday.com/newsletter 🎧 PODCASTS Universe Today: https://universetoday.fireside.fm/ Astronomy Cast: http://www.astronomycast.com/ 🤳 OTHER SOCIAL MEDIA Mastodon: astrodon.social/@fcain Twitter:   / fcain   Twitter:   / universetoday   Facebook:   / universetoday   Instagram:   / universetoday   📩 CONTACT FRASER [email protected] ⚖️ LICENSE Creative Commons Attribution 4.0 International (CC BY 4.0) You are free to use my work for any purpose you like, just mention me as the source and link back to this video.