Astronomy links
NASA - Mars Rover, Cassini-Huygens
Huygens video
Hayden Planetarium
Eratosthenes
Solar system - virtual tour
Kitt Peak National Observatory - Arizona
Astronomy course - historical perspective
Hipparcos - parallax, more
Mount Wilson Observatory - Palomar Observatory
Pierre Auger Observatory - cosmic rays
Large Synoptic Survey Telescope
http://www.spaceweather.com/flybys
Messier objects
New! - Mud volcanoes on Mars?
