From Youtube, "The night sky seems peaceful and orderly. But in reality, stars are careening through the galaxy at speeds of hundreds of thousands of kilometers per hour. Not bound by static formations but changing neighborhoods constantly. Fortunately, space is big, and so the stars of the Milky Way are very unlikely to hit us. Unfortunately, they don’t have to hit anything to make us have a really bad time on earth. And there are already stars starting to get very close."