Steve Cullen, president of LightBuckets Online Telescope Rental, just sent me a cool video he took Thursday night. It shows Venus and Mercury setting behind the Chiricahua Mountains April 8, 2010, from the LightBuckets facility in Rodeo, New Mexico.Both planets now lie in the constellation Aries the Ram. In the video, magnitude 0.1 Mercury sets first. Then Venus, blazing at magnitude –3.9 (40 times brighter than Mercury), sets. The star just above Venus is 29 Arietis, which glows at magnitude 6....