Date- 25 Feb 09 Source- http://www.esa.int/esa-mmg/mmghome.pl 'The 'dark side of space' dominates our Universe: dark energy, dark matter and black holes cannot be seen, but can be detected due to their gravitational pull on the objects around them. ESA's science missions including XMM-Newton, the Hubble Space Telescope and the Planck microwave observatory are investigating these phenomena.'
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