Why would aliens come all this way just to invade Earth?

In movies, when aliens invade our planet, they usually have a ludicrous motivation. Like, they're after our water. Or our gold. (Hint: Asteroids have gold.) Space travel is incredibly difficult and expensive — so why would aliens actually bother to come and invade us? We asked some experts for reasons that actually… » 5/02/13 1:30pm 5/02/13 1:30pm

11 of the Weirdest Solutions to the Fermi Paradox

Most people take it for granted that we have yet to make contact with an extraterrestrial civilization. Trouble is, the numbers don’t add up. Our Galaxy is so old that every corner of it should have been visited many, many times over by now. No theory to date has satisfactorily explained away this Great Silence, so… » 3/20/13 10:01am 3/20/13 10:01am

The ALMA telescope has just made its first major discovery

Today is inauguration day for ALMA, the massive telescopic array that’s still under construction in Chile’s Atacama Desert. But just because it’s not finished doesn’t mean astronomers haven’t been using it. The $1.5 billion telescope has just peered into the deepest realms of the universe, revealing some of the most… » 3/13/13 2:07pm 3/13/13 2:07pm