"We observed hundreds of millions of stars and planets, but we only found one homeless planet in our neighbourhood."
This planet appears to be an astonishingly young 50-120 million years old.
The paper is published at arxiv.org.
Here's hoping the Mayan End-of-World-2012 people don't seize upon this as some kind of impending rogue planet on a collision course with Earth, but one can expect it'll be bantered about on such forums.
Link to Original Source