Explore Hunting the Edge of Space
Saving Hubble: Expert Q&A
The crew of the upcoming STS-125 Space Shuttle mission to repair the Hubble answers viewer questions.
Saving Hubble Update: Expert Q&A
Astronauts John Grunsfeld and Mike Massimino answer questions about their highly risky 2009 mission.
Galileo's refractor and Newton's reflector remain the two standard types of optical telescopes today.
SETI: The Search for ET
Astronomers have their radio telescopes tuned to receive signals from alien worlds. But is anybody out there?
Astronauts prepare for the final mission to revive the ailing Space Telescope.
The Founders of Modern Astronomy
The Englishman William Herschel often gets the credit, but his sister Caroline was also a pioneer astronomer.
Gravity. Laws of motion. Reflecting telescope. Calculus. The list of Sir Isaac's accomplishments goes on...
Hubble Sees Galaxy Shaped Like Video Game Character
A Window into New Physics
Bursts of radio waves lasting just milliseconds could reveal the physics behind dark matter or quantum gravity theories.
Hubble's Amazing Rescue
Newton's Dark Secrets
Centuries-old manuscripts reveal the hidden pursuits of a scientific genius
Pursuing Dark Matter, Hundreds of Miles Above Earth
We're about 12 million cosmic ray collisions from better understanding dark matter, say physicists at CERN.
The Star In You
Just what do astronomers mean when they say we're all made of star stuff?
Galactic Explorer Andrea Ghez
Astronomer Andrea Ghez recounts how she discovered a supermassive black hole in the Milky Way.