Join us as we follow NASA’s latest rover, Curiosity.
Imagine yourself in the middle of the vast Pacific Ocean. You've been sailing for weeks, and there's no land in sight. Do you know where you are? Do you know which way to go?
Join us as we visit the Hubble Space Telescope, and see what's happening at Mission Control.
Far north in the night sky, a faint glow appears on the horizon. Green and red flames of light stretch across the sky.
See the tiny disk of Mercury slowly travel across the face of the sun in this rare event.
Explore Saturn, its rings and moons, and see the latest images.
Explore our 2000 guide to the solar max, the period in the solar cycle during which the number of sunspots is greatest.
Your guide to the Northern and Southern Lights (also in 'Observatory')
Explore stories, dispatches, photos, and articles, as well as archived webcasts of total and annular solar eclipses and transits.