OHIO FIREBALL: Last night, just before midnight on Sept. 27-28, sky watchers in more than a dozen US states witnessed a bright flash of light. NASA all-sky cameras recorded a brilliant fireball, which analysts believe was a meter-class space rock exploding almost directly above Columbus, Ohio. Images and more information about this event may be found on today’s edition of http://spaceweather.com.
COMET ISON APPROACHES MARS: Comet ISON is about to have a close encounter with Mars, giving Red Planet rovers and satellites a close-up view of the sungrazing comet. Amateur astronomers can watch the encounter as it plays out in the predawn sky between now and October 2nd. Check http://spaceweather.com for sky maps and observing tips.