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What Earth and Moon Look like to Aliens.

Check out this video NASA's Deep Impact Sapcecraft made, of the moon passing in front of Earth, viewed from 31 million miles away. Kind of cool to think that this is how aliens might see us from somewhere off in the distant universe.

The clip combines several images of the moon rotating around the Earth in color. According to NASA, Deep Impact is the only spacecraft to show the moon passing around the earth in detail: you can actually see our oceans and continents, and the moon's large craters.


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The Science of Ice Cream: Part One

Even though it's been a warm couple of months already, it's officially summer. A delicious, science-filled way to beat the heat? Making homemade ice cream.

(We've since updated this article to include the science behind vegan ice cream. To learn more about ice cream science, check out The Science of Ice Cream, Redux)

Over at Physics@Home there's an easy recipe for homemade ice cream. But what kind of milk should you use to make ice cream? And do you really need to chill the ice cream base before making it? Why do ice cream recipes always call for salt on ice?