Quote from "
New map of Universe's dark matter"
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The survey involves taking pictures of 26 million galaxies across a large expanse of the sky using the Blanco telescope in Chile. To do this, the research team had to build one of the most sensitive cameras ever built. The 570-megapixel camera is capable of detecting light from galaxies that are eight billion light-years away.
By studying the way in which the light was distorted by the intervening dark matter, researchers were able to calculate its distribution. And by studying the way in which the distribution changes over time they can calculate the way in which dark energy acts on it.
The team was also able to infer the amounts of dark energy and dark matter from the density and locations of galaxies.
The results show support for previous studies that indicate the Universe is made up of 4% ordinary matter, 26% dark matter and 70% dark energy.
The hope is that a detailed study of the map will give clues about what dark matter and dark energy might be and so lead to a more complete theory of physics.
The data released today draws from just one year of observations. The researchers plan to collect data for four more years over an even larger area of the sky. Prof Lahav says that there is much more to come.
He explained: "Once we have the full survey, 300 million galaxies and a thousand supernovae, we may be providing input for a new Einstein to tell us what does it all mean - why is the Universe made the way it is?"
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