Astronomy Picture of the Day . The Keyhole Nebula . ... The dark dusty Keyhole Nebula gets its name from its unusual shape. Officially designated NGC 3324, the Keyhole Nebula is a smaller region superposed on the larger Eta Carina Nebula. These nebulae were created by the dying star Eta Carina, which is prone to violent outbursts during its final centuries. ... Europe at Night . ... Landsat 7 Views Planet Earth . ... Launched last month, NASA's Landsat 7 spacecraft now orbits planet Earth. ...