What is a solar sail?
Quick Answer
A solar sail is a spacecraft propulsion system that uses sunlight pressure instead of fuel. Thin reflective sheets can slowly accelerate in space.
The Full Story
A solar sail uses the momentum of photons from sunlight to push a very lightweight spacecraft. The force is tiny, but in the vacuum of space it can build up over time and allow continuous acceleration without carrying much propellant. Japan’s IKAROS mission, launched in 2010, was the first spacecraft to demonstrate successful solar-sail flight in interplanetary space. Solar sails are attractive for long-duration missions because they can operate for years with little or no fuel consumption.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Can sunlight really push a spaceship?"
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.