Earth with city lights (artist's impression)

The stars and galaxies we see in the night sky represent only one sixth of the total matter in the Universe. The remainder is a mysterious component - dark matter - that neither emits nor reflects light. So, for astronomers, the challenge of mapping the Universe has been similar to mapping a continent from just the lights of the cities.

Credit:

ESA/Hubble (M. Kornmesser & L. L. Christensen)

About the Video

Id:heic0701b
Release date:7 January 2007, 19:30
Related releases:heic0701
Duration:27 s

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