Past Stories by Subject

10th Planet - Jan. 2006
A stunning discovery at the far reaches of our solar system raises questions about what makes a planet a planet.

Asteroid - Oct. 2006
Will a doomsday rock the size of the Rose Bowl hit Earth in 2036?

Booming Sands - Jan. 2005
Scientists look into a generations-old conundrum: how and why do certain sand dunes produce mysterious noises?

CERN - July 2007
Beneath the Alps, the mother of all particle accelerators nears completion.

Dark Matter - June 2008
Turns out most of the universe is held together by a mysterious, invisible substance.

Don't Ask the Expert: Neil deGrasse Tyson - Oct. 2005
Neil deGrasse Tyson has a bone to pick with Hollywood aliens.

Hunt for Alien Earths - July 2009
Astronomers may be on the brink of finding Earth-like planets beyond our solar system.

Hurricanes - Jan. 2005
Predicting a hurricane's intensity is notoriously difficult, but new tools may make it easier.

Island of Stability - Oct. 2006
Follow the decades-long quest to create the elusive element 114.

Lightning - Oct. 2005
Experts still aren't sure what triggers it, but they suspect cosmic rays from outer space.

Moon Smasher - July 2009
A NASA satellite called LCROSS heads to the moon in the hope of finding buried water.

Phoenix Mars Lander - July 2008
NASA's latest robot has already found frozen water and is looking for more signs that the Red Planet could support life.

Profile: Arlie Petters - July 2007
A boy from a rural village in Belize grows up to become a world-class mathematician and cosmologist.

Saving Hubble - July 2008
Two teams of spacewalkers take on the risky mission of reviving the ailing Space Telescope.

The Search for ET - July 2008
Astronomers have their radio telescopes tuned to receive signals from alien worlds. But is anybody out there?

Space Elevator - Jan. 2007
Can we build a 22,000-mile-high cable to transport cargo and people into space?

Space Storms - July 2008
Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth.