Ron Shaneyfelt: 太空会消灭我们人类吗？ - Ron Shaneyfelt

太空会消灭我们人类吗？ - Ron Shaneyfelt

观看完整的视频: 
http://ed.ted.com/lessons/is-space-trying-to-kill-us-ron-shaneyfelt

来自太空的小行星破坏地球和其居民的概率究竟有多大呢？那太阳呢 — 它是否即将衰灭呢？此外，我们又是否要担心存在于银河系中的巨大的黑洞呢？Ron Shaneyfelt 将会告诉我们太空的危险性。

  授课：Ron Shaneyfelt 
  动画制作：Retchy

Space is full of hazards, from asteroids to black holes, but most threats are less immediate than they seem. The odds of asteroid Apophis hitting Earth in 2036 were once 1 in 625, but scientists now say the risk is extremely low. The sun has enough fuel to last billions of years, and the galaxy’s supermassive black hole is safely distant. Despite dramatic dangers, life on Earth remains far more vulnerable to everyday risks than to cosmic disasters.