A German newspaper reported last week that 13-year-old Nico Marquardt corrected a few glitches in NASA's estimates regarding the chances of a certain asteroid colliding with Earth. NASA concluded that the Apophis space rock has only a 1 in 45,000 chance of knocking into us, but this school-kid announced that the space agency had missed a few zeros, suggesting that the probability is closer to 1 in 450. And while quite a few news reports backed him up, even claiming that NASA agreed Marquardt was correct, the space agency is sticking to its estimates.

It packs 4 million times more material than our sun, but relative to the black holes sitting at the center of some neighboring galaxies, it actually doesn't do all that much. The fact that this black hole, known as Sagittarius A*, kicks out billions of times less energy than others of its kind has made it something of a mystery. But now a team of scientists at Kyoto University suggests that Sagittarius A* may be resting after a far more active period a few centuries ago.