| http://www.w3.org/ns/prov#value | - This picture is a mosaic combining 45 images taken by the Hubble Space Telescope.Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC95-45a)Detailed radio maps of nearby molecular clouds reveal that they are clumpy, with regions containing a wide range of densities???from a few tens of molecules (mostly hydrogen) per cubic centimetre to more than one million.
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