Solar system montage with eight planets

Bill Gray

Bill Gray is the creator of the Guide astrometry software, which is used by both professional and amateur astronomers worldwide to track Near-Earth Objects, asteroids, minor planets and comets.

Latest Articles

Comet ISON: 30% chance of awesome, 60% chance of that being wrong

A very interesting comet has recently been discovered -- interesting because it will nearly graze the Sun in August 2013 and then approach Earth closely the following December. Whether it will turn out to be a great comet is impossible to know.

Chang'e 2: The Full Story

An update on China's second lunar orbiter, Chang'e 2, which is now heading for asteroid Toutatis.