
One way into astronomy for a lot of people, I suspect, is the beauty of the planet Saturn, second largest planet in our system (95 times the mass of the Earth). NASA's Cassini space probe, still orbiting the planet, has sent back a multitude of extraordinary photos that show us this gem of the solar system in close up. Other planets have rings, but these are simply spectacular, and visible from Earth through even a small telescope. Made largely of...