One legacy of Carl Sagan may take flight next week—a working solar sail

Enlarge / Artist's concept of LightSail 2 above Earth. (credit: Josh Spradling / The Planetary Society)

As early as next Monday night, a SpaceX Falcon Heavy rocket will launch a cluster of 24 satellites for the US Air Force. Known as the Space Test Program-2 mission, the rocket will deposit its payloads into three different orbits. Perhaps the most intriguing satellite will be dropped off at the second stop—a circular orbit 720km above the Earth's surface. This is the Planetary...

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