Bill Nye (The Science Guy) wants you to get excited about space exploration. His latest effort is pretty tantalizing: Along with the rest of the Planetary Society, Nye is getting ready to launch a satellite powered by the sun. And we're not talking about boring old solar panels, either.
LightSail is like something out of a science fiction novel. The silvery material unfolds into a space-age version of a fabric sail. Then the sun pushes it forward, using the natural momentum of its photons. The force is small, but continuous.