Ask Ethan: Could an atmosphere slow down a runaway spaceship? (Synopsis)

“Yes, now there is this technological path. But it’s just starting.” -Mae Jemison Earlier this month, Yuri Milner and Stephen Hawking teamed up to announce the Breakthrough Starshot, a $100 million investment in technology that would build a laser array to propel a thin, light “laser sail” spacecraft to approximately 20% the speed of light. … Read more