Biggest near-Earth object to pass this close since this category of objects was discovered over a century ago. Closest tomorrow, but online viewings start today.
A new study uses data from ESA's Gaia satellite to give the first systematic estimate of how often passing stars nudge comets from the Oort Cloud and send them plunging toward the inner solar system.
In 2017, the autumnal equinox for the Northern Hemisphere comes on September 22. Official Harvest Moon is October 5, but the September 5-6 full moon shares the characteristics of a Harvest Moon.
