... 3D Mercury Transit . ... Mercury is now visible shortly before dawn, the brightest "star" just above the eastern horizon. But almost two weeks ago Mercury actually crossed the face of the Sun for the second time in the 21st century. ... Runaway stars are massive stars traveling rapidly through interstellar space. ... A Leonid Meteor Over Sweden . ... The sight of Mercury's tiny round disk drifting slowly across the face of the Sun inspired and entertained many denizens of planet Earth last week. ...