
This all-sky wrap-around image is the ultimate limit of our vision, the cosmic microwave background. When the fireball of the early Universe cooled enough to be transparent to light it was about 380,000 years old and had a temperature of about 3000 degrees — the same as a tungsten filament in a light bulb. As the universe has expanded, the wavelength of this ancient light has been stretched, so now, 13.7 billion years later, it appears as microwaves, covering the whole sky.
The different colours indicate tiny changes in temperature in the original fireball, which we see from inside. They indicate structures in the young universe which eventually evolved into the vast clusters and sheets of galaxies we see today. The image is the result of several years observations, by the Wilkinson Microwave Anisotropy Probe (WMAP).
Photography by the WMAP Team for NASA.
Post by David Malin From Earth to the Universe team.











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