Universe Today Podcast

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

April 5th, 2022  •  35 mins 18 secs  •  Download (32.3 MB)  •  Link with Timestamp

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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?