799: Navigation in Space, Sizes of Black Holes and Planet 9 | Q&A 178

Universe Today Podcast · Apr 5, 2022 · 35m

In this week's live Questions and Answers show, I explain how big black holes are, what coordinate system astronomers use to map objects in the sky, and what could have collapsed clouds of hydrogen to form the first stars?00:00 Start00:42 How big are black holes?03:15 What coordinate system do astronomers use to map objects in space?06:50 What created the first stars?08:19 If Planet 9 is a black hole, how could we detect it?10:10 How do gamma rays escape the gravity of a black hole?11:04 Any alternative theories to the Big Bang that I find convincing?14:51 Where is Starman right now?15:44 How…