The SciencesJuly 1, 2003
Alien Reality; Mechanical Food; Riot Bones
Extraterrestrial Life
Space & PhysicsDecember 20, 2001
Sugars from Space Shed Light on the Origin of Life
The Young American Scientists Issue—Read Now
Space & PhysicsNovember 21, 2001
Crystal Study Counters Case for Former Life on Mars
The SciencesJuly 31, 2001
Scientists Say They Have Found Extraterrestrial Life in the Stratosphere But Peers Are Skeptical
Space & PhysicsJuly 30, 2001
Reanalysis of Decades-Old Data Reveals Signs of Life on Mars
Space & PhysicsJuly 1, 2000
The Search for Extreme Life
If microorganisms exist on other worlds, the head of NASA's fledgling Astrobiology Institute plans to find them
The SciencesJuly 1, 1999
Life's Far-Flung Raw Materials
Life may owe its start to complex organic molecules manufactured in the icy heart of an interstellar cloud
Space & PhysicsFebruary 23, 1998
Could silicon be the basis for alien life forms, just as carbon is on Earth?