
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

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

Did Life Come from Another World?
New research indicates that microorganisms could have survived a journey from Mars to Earth


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

Astronomers Scout Out Life-Friendly Stars

Alien Reality; Mechanical Food; Riot Bones

Sugars from Space Shed Light on the Origin of Life

Crystal Study Counters Case for Former Life on Mars

Scientists Say They Have Found Extraterrestrial Life in the Stratosphere But Peers Are Skeptical

Reanalysis of Decades-Old Data Reveals Signs of Life on Mars

The Search for Extreme Life
If microorganisms exist on other worlds, the head of NASA's fledgling Astrobiology Institute plans to find them

Life's Far-Flung Raw Materials
Life may owe its start to complex organic molecules manufactured in the icy heart of an interstellar cloud

Could silicon be the basis for alien life forms, just as carbon is on Earth?