View full lesson: http://ed.ted.com/lessons/is-space-trying-to-kill-us-ron-shaneyfelt
How likely is it that a massive asteroid will do major damage to Earth and its inhabitants? What about the sun -- is it dying out anytime soon? And the supermassive black hole at the center of the Milky Way -- should we be worried about that? Ron Shaneyfelt assesses the dangers of space.
Lesson by Ron Shaneyfelt, animation by Retchy.