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. download the app Email address Sign up By clicking “Sign Up”, you accept our Terms of Service and Privacy Policy . 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.

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Persons: NASA's Chandra, —, Chandra Organizations: Service, NASA, Einstein Observatory