Skywatchers will witness a rare event as the Moon, Mars, and Mercury appear close together in the twilight sky this October.
On the evening of Oct. 9, a waning gibbous moon visits the famous Pleiades Star Cluster  — the Seven Sisters  — in Taurus.
Look south of the moon's equator on Oct. 4 to find Mare Nubium (Latin for "the Sea of Clouds") darkening a vast swathe of the ...