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

• 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.

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.