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We finally know exactly how dark deep space is

Illustration showing NASA’s New Horizons spacecraft in deep space NASA, APL, SwRI, Serge Brunier (ESO), Marc Postman (STScI), Dan Durda We finally know just how dark it is in deep space. NASA’s New Horizons spacecraft has made the first precise measurements of the ambient light that suffuses the universe, called the cosmic optical background. The […]