Exploring Europa, Universe Expansion, and Coronagraph Technology

What are those lasers shooting out from telescopes? Can we build a space elevator? Could we grow plants in Mars regolith? Why not assemble telescopes in space? Answering all these questions and more in this week's Overtime Q&A.

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• 00:00 Start

• 00:50 Could we plant in Mars regolith?

• 02:35 What is the bright laser coming out of telescopes?

• 06:08 Will telescopes be assembled in space?

• 07:59 Would we have our money's worth if JWST broke?

• 08:45 Any updates on space elevators?

• 12:52 Will Breakthrough Starshot happen soon?

• 15:24 What about a low-mass black hole?

• 16:37 Could Gemini North and South do optical interferometry?

• 19:06 Thoughts on Europa?

• 21:46 How do galaxies collide if the Universe is expanding

• 22:45 Could an LCD screen be a coronagraph?

• 26:46 How does light travel farther than 13.8 billion light-years?

• 28:19 Are we looking for machine civilizations?

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