New data from a pioneering six-year survey expands a colossal 2D map of space.
. The aim of the project is to identify around 40 million galactic targets that can be used to precisely map the expansion history of theThese targets are used by the five-year DESI Spectroscopic Survey, a project that could help scientists finally understand, the mysterious force that is driving the accelerating expansion of the universe.
That means adding more images and incorporating better image processing techniques into the DESI Legacy Imaging Survey which already builds on the data from two earlier companion surveys: the Dark Energy Camera Legacy Survey and the Beijing-Arizona Sky Survey. Jointly these three surveys have imaged 14,000 square degrees of the sky over Earth's northern hemisphere using telescopes at Kitt Peak National Observatory and Cerro Tololo Inter-American Observatory in Chile.
The 10th data release expands that coverage to 20,000 square degrees, nearly half the sky over Earth, by adding to the map DECam images of the sky over the southern hemisphere away from the glare of theIn addition, the new data includes images of the sky with an additional filter that provides a view of the sky in near-infrared, just beyond the visible light spectrum that humans can see.
"The addition of near-infrared wavelength data to the Legacy Survey will allow us to better calculate the redshifts [the stretching of wavelengths of light via the expansion of the universe] of distant galaxies or the amount of time it took light from those galaxies to reach Earth," CTIO astronomer Alfredo Zenteno, said in a
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