A composite false-color image of fire in space. The bright yellow traces the path of a drop of fuel, shrinking as it burns, producing green soot. Paul Ferkul / NASA Recent tests aboard the ...

This is a false color scanning electron micrograph of a T cell (green) on an array of clusters of T cell receptor ligands (not visible) bound to gold-palladium nanoparticles (gold, there are seven ...

NGC 7293, better known as the Helix nebula, displays its ultraviolet glow courtesy of NASA's Galaxy Evolution Explorer (GALEX ...