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It may account for more than 80% of the matter in the universe and provide the "gravitational glue" that keeps galaxies together, but dark matter remains a mystery – despite tantalizing hints obtained...
NASA Spacecraft Provides First View of Our Place in the Galaxy
NASA Spacecraft Place the Galaxy
2009/10/21
NASA's Interstellar Boundary Explorer, or IBEX, spacecraft has made it possible for scientists to construct the first comprehensive sky map of our solar system and its location in the Milky Way galaxy...