How to Explain to Children Why, in Space, No One Can Hear Them Scream

We all love that famous movie tagline, but it can be tough for kids to understand. Here's a basic experiment you can do with kids — or for your own curiosity — to demonstrate exactly how a vacuum can eliminate sound. All it takes is a bottle, a bell, and a couple of matches. Try it out! » 1/04/13 4:00pm 1/04/13 4:00pm

10 Things To Keep In Mind On Your First Trip To Low Earth Orbit

The future of civilian space travel in low Earth orbit (or "LEO," for those in-the-know) is looking brighter by the day, but what will life be like when you're soaring hundreds of miles above Earth's surface? How will you eat, how will you sleep, and how will you go to the bathroom? We've got a preview of ten things… » 12/05/11 10:25am 12/05/11 10:25am

No one can escape friction, not even in a vacuum.

On earth, we're slowed down by the muck of the everyday world. Matter slows us down, rubbing against us and taking away our speed and power. Gravel, air, even slip-n-slides, exert some friction on us. This frictional force runs counter to our motion, and it can't be escaped anywhere on earth. Eventually, inevitably,… » 2/13/11 2:00pm 2/13/11 2:00pm

Meet the Tardigrades: The Solar System's Most Extreme Survivors

There is an organism living on this planet who can travel through space without a suit. Cute, unassuming little invertebrates, these organisms are called tardigrades, or water bears, and usually spend their days crawling around on a piece of nice wet moss in a forest, or meandering through our vast oceans. They only… » 7/10/08 9:41am 7/10/08 9:41am