... Tonight's Sky . ... solar system . ... Tune into the Asteroid Day press conference . ... Sunlight makes asteroids binary system . ... Asteroids with moons, which scientists call binary asteroids, are common in the solar system. ... The authors say that their current findings also suggest that a space mission to a binary asteroid could bring back material that might shed new light on the solar system's early history. ... Only registered members of Astronomy.com are allowed to comment on this article....