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?
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.
Journey into Chaco Canyon, where ancient people built monuments to the cosmos. Journey to Chichén Itzá, where the Maya built monuments to the sun.
An introduction to spectra and to the space-based telescopes. The site includes a number of hands-on activities.
Pier 15, San Francisco, CA 94111
© 2014 Exploratorium