Solar Sails and Comet Tails: How Sunlight Pushes Stuff Around

https://media.wired.com/photos/66e1e60aa7aaf6d5a412e802/master/pass/solar-sail-nasa-sci-.jpg

It seems crazy, but light actually exerts a physical force on objects. It could power a new generation of spacecraft for deep-space missions.

https://www.wired.com/story/how-solar-sails-can-work-to-propel-spacecraft/