[Q&A] True Color of Sunspots, Saving the Earth, Identifying Interstellar Objects

How many stars did our radio signals reach? How to visualize the expansion of the Universe? Can we save the Earth from the Sun's red giant phase? How can we tell that an object has interstellar origin? All this and more in this week's Q&A! 🦄 Support us on Patreon: https://patreon.com/universetoday 00:00 Start 01:02 [Tatooine] If the Sun is white, are sunspots really black? 05:19 [Coruscant] How many stars did our radio signals reach? 08:51 [Hoth] How do gravitational assists work? 11:43 [Naboo] How to visualize the expansion of the Universe? 13:35 [Kamino] How will the Mars sample return mission find all the dropped tubes? 16:27 [Bespin] Can Earth survive the Red Giant phase of the Sun? 20:16 [Mustafar] What effect will a supernova have on nearby stars? 21:51 [Alderaan] Should the US continue to explore space? 24:16 [Dagobah] Can we time travel with a wormhole? 26:59 [Yavin] What killed the Chinese Mars rover? 29:32 [Mandalore] How does light pollution work? 33:04 [Geonosis] How can we tell that an object is interstellar? 📺 VIDEO VERSION https://youtu.be/izgLlgeJH-0 📰 EMAIL NEWSLETTER Read by 55,000 people every Friday. Written by Fraser. No ads. Subscribe. It's FREE: https://universetoday.com/newsletter 🎧 PODCASTS Universe Today: https://universetoday.fireside.fm/ Weekly Space Hangout: https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/ Astronomy Cast: http://www.astronomycast.com/ 🤳 OTHER SOCIAL MEDIA Twitter: https://twitter.com/fcain Twitter: https://twitter.com/universetoday Facebook: https://facebook.com/universetoday Instagram: https://instagram.com/universetoday 📩 CONTACT FRASER frasercain@gmail.com ⚖️ LICENSE Creative Commons Attribution 4.0 International (CC BY 4.0)