Contents

10 April 2015
Vol 348, Issue 6231

About The Cover

Cover image expansion

COVER On 27 February 2015, Planet Labs released two CubeSats from the International Space Station, adding to its swarm of Earth-observing satellites, which are no larger than a loaf of bread. Each CubeSat can discern features as small as trees and trucks. But the real power comes from having dozens, even hundreds, in space; the company plans to image the entire Earth every day. See page172.
Photo: NASA