Using Sunlight to Propel Spaceships

When scientists are planning missions, they sometimes have to take into account the fact that the light from the Sun pushes on the spacecraft. But with solar sails, they can also use that pressure to propel the craft along.

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Sources:
http://descanso.jpl.nasa.gov/evolution/AAS_08-051.pdf
http://time.com/3643896/kepler-planets-repair/
http://www.planetary.org/blogs/jason-davis/2014/lightsail-update-launch.html
http://sail.planetary.org/
http://www.jpl.nasa.gov/cubesat/missions/neascout.php
http://www.lpi.usra.edu/sbag/meetings/jul2014/presentations/0930_Thu_Castillo_NEAScout.pdf