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Hubble Presses Towards Cosmic Dawn
In March, NASA unveiled the Hubble Space Telescope's Ultra Deep Field (UDF), an 11.3-day exposure that represents humanity's deepest optical look into the universe. Althought it’s smattered with beautiful spiral and elliptical galaxies lying a few billion light-years from Earth, several teams of astronomers have focused on the faintest, farthest objects in the UDF — tiny red smudges that are barely discernible. While not exactly eye candy, these smudges were primarily responsible for one of the universe's most critical transitions: reionization.
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