... X-Rays from the Galactic Plane . ... Tycho and Copernicus: Lunar Ray Craters . ... But when the Moon is full some craters seem to sprout systems of bright radial lines or rays. Farewell Jupiter . ... Next stop: Saturn. The Cassini spacecraft, launched from Earth four years ago, has now swung past Jupiter and should arrive at Saturn in the year 2004. Pictured to the left is a parting shot from Cassini in January that would not have been possible from Earth: Jupiter showing a crescent phase. ...