AFP - The Milky Way, the Earth's home galaxy, is spinning much faster and has a mass 50 percent larger than previously believed, raising the probability of a collision with another galaxy, according to a report out Monday.

Apple co-founder and chief executive Steve Jobs posted an open letter to customers on his company's Web site today in which he says that he's being treated for an unspecified "hormone imbalance" that has caused severe weight loss and kept him out of the public eye. Jobs's letter is short on details, making it difficult to figure out the actual disorder that he's battling, says Robert Lustig, professor of clinical pediatrics at the University of California, San Francisco. "There are three medical threads that run through the [letter], but unfortunately they don't form a strong cable," he says. [More]

More than half of teens on MySpace discuss or post images on their profiles of sex, drugs and violence, new research shows. But another study finds that reminding kids the info is public may tame the content they publish on the social-networking site. [More]

AP - Take that, Andromeda! For decades, astronomers thought when it came to the major galaxies in Earth's cosmic neighborhood, our Milky Way was a weak sister to the larger Andromeda. Not anymore. The Milky Way is considerably larger, bulkier and spinning faster than astronomers once thought, Andromeda's equal.

When NASA's Spirit and Opportunity rovers touched down on Mars, they were each tapped for three-month missions exploring the Red Planet. But five years later, both are still moving, providing a bright spot at a tumultuous time for the space agency. [More]