There’s now a way for everyone who has ever dreamed of being an astronaut to view the universe from the comfort of their home: an interactive map of the known cosmos, which lays out 200,000 galaxies in their actual positions in space.
This map shows a slice of our Universe, created from astronomical data taken night after night over a period of 15 years using a telescope in New Mexico, USA. The Milky Way is located at the bottom, while at the top is the actual edge of the observable Universe. In between, we see about 200,000 galaxies.
The idea for the map came from Brice Ménard, a professor at Johns Hopkins who said he grew up gazing at astronomy photos of stars, nebulae and galaxies."Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries,” he The Sloan Digital Sky Survey is a project based in New Mexico, where a telescope has been painstakingly mapping out the night sky by pointing in different directions to slowly gather pieces of information. Only a fraction of the data it has collected was used to make this new map.
As you scroll back in time, the colours on the map shift. This gradient isn’t just for show — the colours of galaxies as they appear to us is actually part of how scientists understand how far away from us galaxies or stars are. Light wavelengths are shifted to become longer and redder as they move away from us with the continuing expansion of the universe, a term called “redshifting”.
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