Pythagorean Astronomy

Mars is covered in craters, but most of them are very old. But new ones do appear from time-to-time, created when objects hit the surface of the red planet. That's just what happened at some point a couple of years ago, producing one of Mars' youngest craters. Higher up in Mars' atmosphere, scientists are also learning about the role the micrometeorites play in forming clouds. And how can the Moon reveal secrets about history of the Sun? Closer to home, there has been controversy about once of the latest SpaceX launches, which released 60 satellites into orbit. While impressive, and part of plans for over 10,000 such satellites in orbit, there has been some opposition from astronomers, for whom satellites are a constant irritation. But to the ends (worldwide satellite internet) justify the means? Meanwhile, over a million vounteers have been clicking away on the Galaxy Zoo website, part of the Zooniverse. Chief zookeeper Prof Chris Lintott explains what astronomers have discovered as a result of all this ef