An illustration of an asteroid against a starry background in space.
The asteroid flying by Earth won't make another close approach to our planet until 2037.
  • A giant "city killer" asteroid will safely shoot past Earth today traveling at 41,000 mph.
  • Its closest approach to Earth will be 1.77 million miles, over seven times the distance to the moon.
  • You can't see it with the naked eye, but you can watch the event live on YouTube.

NASA's Jet Propulsion Laboratory has spotted a giant "city killer" asteroid flying toward Earth. And this afternoon, it will reach its closest approach to our planet, about 1.77 million miles away.