News tagged with travel time

A laser beam's path through NASA's ICESat-2

Before beaming 300 miles to Earth's surface, bouncing off the ground and travelling another 300 miles back into space, the laser photons on NASA's Ice, Cloud and Land Elevation Satellite-2 first have to complete a 7½-foot ...

dateJun 17, 2015 in Space Exploration
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What makes us human?

What separates humans from other animals, including our closest relatives? It's one of those big questions perennially posed by the evo-curious public. But until recently I seldom gave it much thought. Mostly because the ...

dateJun 03, 2014 in Evolution
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