Space & PhysicsNovember 29, 2006
SLIDESHOW: The Quest for Alien Life Begins in Our Own Back Yard
Just about every planet in the solar system that might harbor life has an analog on Earth--and that's the first place scientists thought to look
Extraterrestrial Life
Space & PhysicsNovember 1, 2005
Did Life Come from Another World?
New research indicates that microorganisms could have survived a journey from Mars to Earth
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Mind & BrainApril 1, 2005
Alien Friends
For people with Capgras syndrome, loved ones have been taken over by body doubles. Their experience teaches us that feelings are integral to perception
Space & PhysicsJanuary 2, 2004
Astronomers Scout Out Life-Friendly Stars
The SciencesJuly 1, 2003
Alien Reality; Mechanical Food; Riot Bones
Space & PhysicsDecember 20, 2001
Sugars from Space Shed Light on the Origin of Life
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?