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May 15, 2006
How big is big? Probing the conditions of the universe on the largest scales
The SDSS telescope at Apache Point, NM has been used to create a map of regular galaxies (black points) and luminous red galaxies (red points) out to 40% of the distance to the edge of the visible universe. Light from the most distant red galaxies has taken 5.6 billion years to reach us, while the edge of the visible universe is 13.7 billion light years away. This map of the universe allowed astronomers to detect galactic structures more than a billion light years across.
(Credit - Hogg, SDSS-II collaboration)