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.
September 25, 2012
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.
August 25, 2012
An update on China's second lunar orbiter, Chang'e 2, which is now heading for asteroid Toutatis.
Older blog posts
Become a member of The Planetary Society and together we will create the future of space exploration.
Take action today and your gift will go twice as far to increase NASA budgets and advance space priorities.