description LightSail 2 Overview
LightSail 2 was a solar sailing spacecraft developed by the Planetary Society, launched into Earth orbit in 2019. It was a small three-unit CubeSat designed to demonstrate controlled solar sailing technology. The mission successfully proved that a spacecraft could alter its orbit using only the pressure of sunlight as propulsion. The project concluded in 2022 after the spacecraft deorbited, providing data for future solar sail missions.
help LightSail 2 FAQ
Did LightSail 2 actually raise its orbit using sunlight?
Yes. The Planetary Society demonstrated controlled solar sailing by changing the spacecraft's orbital behavior through photon pressure on its reflective sail.
How large was the LightSail 2 solar sail?
Its four triangular sections formed a sail covering roughly 32 square meters. The sail deployed from a compact CubeSat spacecraft in Earth orbit.
How did LightSail 2 differ from LightSail 1?
LightSail 1 was primarily a 2015 deployment test and did not conduct a sustained solar-sailing demonstration. LightSail 2 launched in 2019 with the attitude-control hardware needed to orient its sail repeatedly toward the Sun.
Why did LightSail 2 eventually fall back to Earth?
The spacecraft remained in low Earth orbit, where atmospheric drag gradually reduced its altitude despite the sail's thrust. It reentered Earth's atmosphere in 2022 after operating for more than three years.
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