Space station trash plunging to Earth

A piece of space station trash the size of a refrigerator is poised to plunge through the Earth's atmosphere late Sunday, more than a year after an astronaut tossed it overboard.

NASA and the U.S. Space Surveillance Network are tracking the object — a 1,400-pound (635-kilogram) tank of toxic ammonia coolant thrown from the international space station — to make sure it does not endanger people on Earth. Exactly where the tank will inevitably fall is currently unknown, though it is expected to re-enter Earth's atmosphere Sunday afternoon or later that evening, NASA officials said.

"This has got a very low likelihood that anybody will be impacted by it," said Mike Suffredini, NASA's space station program manager, in an interview. "But still, it is a large object and pieces will enter and we just need to be cautious."