Gravity may be woven into the very fabric of space-time, but some objects seem nearly immune to its pull. Scale something down to the size of a dust particle and you'll find it can stay aloft almost indefinitely, dancing in midair on thermal currents. Cornell University graduate student Justin Atchison set out to create such a miniature spacecraft. The aim of the project "Sprite" is to fit everything a satellite might need onto a 1-square-centimeter integrated circuit.
Via Dr. Stefan Gruenwald