The spacecraft is a minature cubicle satellite that will be launched to space on a rocket. Once it's in space, it will deploy shiny mylar that's bigger than your ceiling, said Nye. Mylar is basically that reflective wall covering used in greenhouses.
"Light is made of photons, but photons have no mass. They have momentum. If sunlight is shining on something, it's giving it a tiny, tiny push," said Nye on the project's website. Sunlight can push spacecrafts that have a large enough area and low enough mass. These types of spacecrafts are called solar sails.