Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty
Use when no other thumbnail exists

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 Blog Posts

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

Posted 2012/09/25 12:15 CDT | 10 comments

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

Posted 2012/08/25 10:55 CDT | 4 comments

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

Older blog posts »

Facebook Twitter Email RSS AddThis


Advocate for Space!

Fifteen years ago, Society members and passionate space advocates like you helped save the Pluto mission. Now we can do the same for missions to Europa and Mars.

Join over 27,600 people who have completed their petition and consider a donation to support advocacy efforts.

Sign Our Petition

Featured Video

A Perfect, Clear Day: LightSail's Launch

Watch Now

Fly to an Asteroid!

Send your name and message on Hayabusa-2.

Send your name

Selfies to Space!

Take flight with a selfie on LightSail™ in 2016!

Send a Selfie Now

Connect With Us

Facebook! Twitter! Google+ and more…
Continue the conversation with our online community!