A reflecting nebula in the constellation Orion NGC 1999 shows a black cloud near its center. SETI’s chief scientist, Seth Shostak, thinks suggests these should be studied in the search for extraterrestrial life.

This is called a "Bok globule," named after late astronomer Bart Bok. It’s a cold cloud of gas, molecules and cosmic dust, so dense it blocks all of the light behind it.
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Our Milky Way galaxy is so big and so old–it contains at least 100 billion planets–so aliens should have visited us by now (Whitley Strieber thinks THEY HAVE!) This is what’s known as the Fermi Paradox.

In Discovery News, Ray Villard talks about science fiction writer Karl Schroeder, who has come upon a solution to the Paradox. He thinks that aliens have "gone green" and generate no waste products that we can detect. They therefore blend into the galaxy. Villard quotes him as saying that, in their case, "artificial and natural systems are indistinguishable." Villard theorizes that maybe only ecologically-balanced civilizations survive in the long run (that means WE won’t last long!)
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Believe it or not, researchers are using a computerized search to look at hundreds of thousands of NASA satellite images of the moon, looking for telltale signs that aliens have visited there. And if they’ve visited our moon, have they visited US?
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