Virtual reality is all the rage, but Microsoft's HoloLens is a $3,000 headset that lets you see in augmented reality — it puts digital pictures and information over your view of the world. The first versions are just beginning to make their way to people outside the company this month, but astronauts in outer space got to try it out before almost anyone. Late last year, Microsoft stashed two of the headsets aboard a rocket capsule headed for the International Space Station. Today, NASA published a video on YouTube showing just how these HoloLens headsets are being used.