Astronomy Picture of the Day . ... Gamma-Ray Bursts (GRBs) were discovered by accident. ... Ultraviolet Earth from the Moon . ... Here's a switch: the above picture is of the Earth taken from a lunar observatory! ... Galactic Centre Starscape . ... Thirty thousand light-years distant, beyond the majestic dust clouds of the constellation Sagittarius, lies the centre of our Milky Way Galaxy. ... BATSE GRB Final Sky Map . ... Newton Crater: Evidence for Recent Water on Mars . ... The Gullies Of Mars . ...