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How to Spot Sky Landmarks: Big Dipper and Southern Cross

This sky map shows the location of Ursa Major, the constellation containing the well known Big Dipper star pattern, as it appears in the late April night sky at mid-northern latitudes.

'Ghost Galaxies' spotted by Hubble

The Hubble Space Telescope has captured images of three odd galaxies that may help scientists solve a 13 billion-year cosmic mystery. (July 12)