[Q&A] My Favourite Space Image, Shape of Oort Cloud, The Concept of Aliens

When did humans first think of aliens? Why is Oort cloud a sphere when the Solar System is a disk? Which space image is my favourite? And in our Q&A+ on patreon, is search for life only limited to looking for water? Answering all these questions and more in this Q&A show. 🎁 [Q&A+] Same video. No YT ads. BONUS question, totally free : https://www.patreon.com/universetoday 🚀 [Overtime] Even more Q&As https://www.patreon.com/universetoday 00:00 Start 00:30 [Paige Potter] When did humans first think of aliens? 03:24 [PaulinTucson] Why is Oort cloud a sphere while Solar System is a disk? 06:51 [Walter Hartman] Are dark matter and dark energy 100% real? 11:33 [Scotty-Too-Hottie] How long before our Sun turns into a red giant? 13:34 [Heya Sasha] My favourite space image 📺 VIDEO VERSION https://youtu.be/k3iCw1Wtdws 📰 GUIDE TO SPACE Newsletter No ads. Subscribe for FREE: https://universetoday.com/newsletter 🎧 PODCASTS Universe Today: https://universetoday.fireside.fm/ Astronomy Cast: http://www.astronomycast.com/ 📩 CONTACT FRASER frasercain@gmail.com ⚖️ LICENSE Creative Commons Attribution 4.0 International (CC BY 4.0)