[Q&A] Messaging The Aliens, Moving the Earth, Shapes of Coronagraphs

How can we let aliens know we're here? What does a lunar eclipse look like as seen from the Moon? Can we record a supernova in real time? Why aren't coronagraphs just circles? Answering all these questions and more in this week's Q&A show. 🦄 Support us on Patreon: https://patreon.com/universetoday 📚 Suggest books in the book club: https://www.goodreads.com/group/show/1198440-universe-today-book-club 00:00 Start 00:37 [Andoria] Can we signal to aliens with green glass? 06:39 [Vulcan] Lunar eclipse seen from the Moon 11:24 [Risa] Can we record a supernova appearing in real-time? 16:05 [Aeturen] Why aren't coronagraphs just circles? 20:53 [Vendikar] How do astronomers determine distances to other galaxies? 25:02 [Remus] Who was my favourite interview? 28:01 [Janus] How do astronomers determine the age of stars? 31:11 [Cait] Can we move Earth by the time the Sun will die? 34:31 [Betazed] Why does the Moon look bigger and yellow sometimes? 📺 VIDEO VERSION https://youtu.be/mz-DcU2VaAs 📰 EMAIL NEWSLETTER Read by 60,000 people every Friday. Written by Fraser. No ads. Subscribe. It's FREE: https://universetoday.com/newsletter 🎧 PODCASTS Universe Today: https://universetoday.fireside.fm/ 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)