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An Echo of the Big Bang

An Echo of the Big Bang

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ESA and the Planck Collaboration - D. Ducros

An Echo of the Big Bang
The anisotropies of the cosmic microwave background (CMB) as observed by Planck. The CMB is a snapshot of the oldest light in our Universe, imprinted on the sky when the Universe was just 380 000 years old. It shows tiny temperature fluctuations that correspond to regions of slightly different densities, representing the seeds of all future structure: the stars and galaxies of today.

Most ESA images can be reused for noncommercial purposes as long as they are properly credited. For more information and other uses, read ESA's copyright notice.

Original image data dated on or about March 21, 2013

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