How would humanity change if we knew aliens existed?

We have yet to discover any signs of an extraterrestrial civilization — a prospect that could quite literally change overnight. Should that happen, our sense of ourselves and our place in the cosmos would forever be shaken. It could even change the course of human history. Or would it? » 2/14/14 8:10am 2/14/14 8:10am

When it comes to exoplanets, science fiction lags way behind science

Sometimes scientific reality surpasses science fiction. That's especially the case today, given all the planets we've discovered beyond our solar system. Now that we know how common exoplanets are, says SETI astronomer Seth Shostak, most of our alien invasion stories no longer make sense. » 6/06/13 11:20am 6/06/13 11:20am

Neil deGrasse Tyson and Bill Nye make the case for NASA's future in

Do you miss the days of space shuttle launches? Do you want to see humans go back to the Moon, and even explore Mars, in your lifetime? Paul Hildebrandt does too. So he's initiated a Kickstarter campaign to create Fight For Space: Exploring the Future of Manned Spaceflight, a documentary with a higher aim than just… » 7/25/12 7:30am 7/25/12 7:30am

10 Awesome Online Classes You Can Take For Free

Back in August, we told you about a free course on artificial intelligence being offered by Stanford University, and co-taught by two world-renowned AI experts. The class officially started today, so if you managed to register for it on time, then good on you. » 10/10/11 10:25am 10/10/11 10:25am