Asteroids may have delivered water to early Earth.
State-of-the-art spacecraft observes our Sun with unprecedented detail.
Satellites go wide, then zoom in on galactic dust.
Ancient quartz crystals reveal our young planet's magnetic field.
Astronomers get a fresh perspective on the Orion Nebula.
Hubble is watching seasons change on the dwarf planet.
Hubble captures the most distant, ancient galaxies ever seen.
AMNH astronomers have revealed a long-hidden star in the Big Dipper's handle.
NASA's new infrared telescope is set to reveal thousands of space objects.
Forty-year-old lunar samples contain trace amounts of water.