MIT Technology Review+ Your Authors @techreview A media company making technology a greater force for good. Get our journalism: Jun. 25, 2019 1 min read + Your Authors

Aboard SpaceX’s latest Falcon launch today was a large reflective solar sail. 

The aim is for the sail to reach 450 miles above Earth, and then orbit for about a year. 

Engineers on the ground will be able to steer it by adjusting the angle of the sails, just like on a boat.

But instead of using the wind to move, the solar sail will use the energy of photons as they strike its gigantic mylar sails to move. 

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