13 photos from NASA's most powerful X-ray space telescope reveal the invisible universe

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NASA's Chandra X-ray Observatory is one of its most scientifically productive space missions. The telescope has been in space for 25 years, discovering black holes and dark matter. Chandra's best images show how it reveals details that other telescopes can't see. Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. download the app Email address Sign up By clicking “Sign Up”, you accept our Terms of Service and Privacy Policy . You can opt-out at any time by visiting our Preferences page or by clicking "unsubscribe" at the bottom of the email. Advertisement NASA has been using X-rays to crack the invisible secrets of the universe for decades. The Einstein Observatory pioneered X-ray astronomy in the late '70s, but the crown jewel of this science field is the Chandra X-ray Observatory, which has been in space for the last 25 years. Here are some of Chandra's most stunning images and groundbreaking discoveries of the invisible X-ray universe.