... Caught in the act earlier this summer by the Hubble Space Telescope, the volcanic moon Io (above and right of center) and its shadow (black dot) are seen here against Jupiter's clouds. ... The Earth's northern hemisphere appears outlined as a sunlit crescent in this dramatic view from the GOES 8 satellite. ... A Close-Up of the Horsehead Nebula . ... The X-Ray Moon . ... It shows three distinct regions: a bright X-ray sky, a bright part of the Moon, and a relatively dark part of the Moon. ...