![]() Though time consuming, this method is the most accurate, allowing highly detailed 3D maps of the matter distribution to be made. The standard way to map the positions of galaxies is to painstakingly detect the faint radio signals from many individual galaxies, staring at them for long enough to measure properties like their distance. ![]() How to map the cosmos: Speed, or accuracy? This includes the mysterious dark matter, which is completely invisible to telescopes, but can be detected through its gravitational pull on other objects, like hydrogen-containing galaxies. "This makes it ideal for tracing the way matter is distributed throughout space". ![]() "Hydrogen is the most common element in the Universe, so we see it everywhere" said Phil Bull, from the University of Oslo in Norway. The key to mapping the cosmos is to detect the faint radio emission from hydrogen gas. A second phase, due in the late 2020s, will be ten times larger still. When the first phase is completed in 2023, the SKA will have a total collecting area equivalent to 15 football pitches, and will produce more data in one day than several times the daily traffic of the entire internet. ![]() The SKA will be a collection of thousands of radio receivers and dishes spread across two sites in South Africa and Western Australia. "The team has produced an exciting collection of cutting-edge ideas that will help shape the future of cosmology", said Working Group chair Roy Maartens, from the University of Western Cape in South Africa. The SKA will be a collection of thousands of radio receivers and dishes spread across two sites in South Africa and Western Australia.Simulation: SKA OrganisationResearchers from the Cosmology Science Working Group of the Square Kilometre Array (SKA) have worked out how to use the world's largest telescope for the task. ![]()
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