... From martian orbit, the Mars Express cameras looked down on the largest volcano in the solar system. The result was this stunningly detailed overhead view of the caldera or summit crater region of Olympus Mons. Moon Between the Stones . ... For one thing, it helps to have a good planet line-up, such as occurred in the sky just last month. ... High above planet Earth, a human helps an ailing machine. ... Comet NEAT (Q4) Over Indian Cove . ... NGC 3372: The Great Nebula in Carina . ...