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Confessions of an Alien Hunter
Topic: Alien Life
03/23/09
After five decades, the search for extraterrestrial intelligence has failed to find any alien signals. SETI researchers are still optimistic that we will one day find evidence for intelligent life somewhere in our galaxy. A new book by SETI scientist, Seth Shostak, reviews the history, the controversies and the reasons for continuing the search.

To See a Clear Day From Far Away
Topic: Alien Life
03/22/09
Astronomers are close to discovering Earth-sized planets in Earth-like orbits around distant stars – but the real question is, are they habitable? Do they have Earth-like atmospheres? Such questions may prove very difficult to answer.

Alien vs. Predator
Topic: Alien Life
03/16/09
At the most recent NASA Astrobiology Science Conference, a panel of scientists discussed different types of planets where we might find alien life. In the fifth segment of this series, the panelists address questions from the audience about the search for life on Mars and elsewhere.

Finding Earth's Twin: No Easy Task
Topic: Alien Life
03/02/09
Are there other Earths out there -- rocky planets capable of supporting life, orbiting sun-like stars at comfortable distances? NASA is about to launch a telescope designed to find the answer.

A Sprightly Explanation for UFOs
Topic: Alien Life
02/25/09
Scientists have discovered a natural explanation for "UFO" sightings in our planet's atmosphere. The phenomenon is caused by thunderstorms, which can cause mysterious "sprites" that zip across the sky.

Uma Explicação “Spriteana” para OVNIs
Topic: Alien Life
02/25/09
Os cientistas descobriram uma explicação natural para avistamentos de “OVNI” na atmosfera do nosso planeta. O fenômeno é causado por trovoadas que podem causar misteriosos sprites que sibilam pelo céu.

Countdown to Alien Life
Topic: Alien Life
02/23/09
At the most recent NASA Astrobiology Science Conference, a panel of scientists discussed different types of planets where we might find alien life. In part four of this series, the panelists discuss the time it will take for us to discover alien life in the universe.

Technology Worlds
Topic: Alien Life
02/16/09
At the most recent NASA Astrobiology Science Conference, a panel of scientists talked about planets where alien life might be found. In the third segment of this series, Jill Tarter describes different kinds of Technology Worlds.

Ice Age Aliens
Topic: Alien Life
02/12/09
The light reflected off of vegetation could be a signal of life on an alien planet. Researchers have now shown that this plant life signal can be seen even if a world is in the midst of an ice age.

Slime Worlds
Topic: Alien Life
02/02/09
At the most recent NASA Astrobiology Science Conference, a panel of scientists discussed different types of planets where alien life might be found. In part one of this series, Seth Shostak reviews the search for extrasolar planets, and Tori Hoehler describes a place of "colorful microbial goo" called Slime World.

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