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The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.
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Sunday, 23 June 2013

Planck maps the dawn of time

Scientists have traced a unique new map of the first light of the universe, and raised profound questions about the Big Bang.The image of the cosmic microwave background they have released was taken by ESA's Planck satellite, and its results could have a significant impact on the field of cosmology.


Acquired by ESA's Planck space telescope, the most detailed map ever created of the cosmic microwave background -- the relic radiation from the Big Bang -- was released this year, revealing the existence of features that challenge the foundations of our current understanding of the Universe.



The following animation explains how the wealth of information that is contained in the all-sky map of temperature fluctuations in the Cosmic Microwave Background (CMB) can be condensed into a curve known as the power spectrum.

The temperature of the CMB exhibits fluctuations on a variety of angular scales on the sky. The animation shows six different maps that depict the relative 'power', or strength, of the fluctuations at different angular scales. The maps correspond to different regions of the curve, starting at angles of ninety degrees on the left side of the graph, through to the smallest scales -- just a fraction of a degree -- on the right hand side.
By studying the peaks in the power spectrum curve, cosmologists can extract information regarding the ingredients of the Universe, such as ordinary matter, dark matter and dark energy, and the overall geometry of the Universe.

Credits: ESA and the Planck Collaboration

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