asteroids stories

Asteroids aren't something to be concerned about on a day to day basis, but once every couple hundred years or so, we get hit with a doozy. The last one hit Siberia in 1908, so it's about time to start to come up with a defense plan, and one new idea involves a bunch of tiny satellites with solar-powered lasers.
When boring people like you and I go on vacation, we might go camping in the woods or something. But not NASA. NASA goes camping on a virtual asteroid. And the worst part is that NASA didn't actually have to take any time off: asteroid camping (among other things) is what it does for a living. Asteroid camping. Not fair.
Today we can all breathe a little easier thanks to a new survey of near-earth asteroids by NASA's Wide-field Infared Survey Explorer (WISE). After a year of scanning the celestial sky with infrared light between January 2010 and February 2011, the study has shown there are significantly fewer mid-size near-Earth asteroids than thought. That's not even the best news.
The Dawn spacecraft has only been orbiting Vesta for a few months now, but it's been taking scads of pictures and streaming them straight back to Earth. Among the highlights are these spectacular oblique images of the asteroid's dramatic topography. Check out some of our favorites from the most recent imagery release in the gallery below.
Don't look now, but our entire planet is busily chasing after an asteroid a thousand feet across that's preceding the Earth in its orbit. It's the first known Earth-orbit example of what are called Trojans, and like other promiscuous planets (I'm looking at you, Jupiter), it now appears that Earth's got 'em.