http://www.esa.int/Our_Activities/Space_Science/Herschel_finds_a_hole_in_space
http://www.esa.int/Our_Activities/Space_Science/Herschel_finds_a_hole_in_space
http://www.esa.int/Our_Activities/Space_Science/Herschel_finds_a_hole_in_space
http://www.esa.int/Our_Activities/Space_Science/Herschel_finds_a_hole_in_space
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