Chandra X-ray Observatory

NASA/SAO · Launched 1999-07-23 · High Earth orbit

Deployed from Space Shuttle Columbia into a long elliptical orbit that carries it a third of the way to the Moon, well clear of Earth's radiation belts for most of each pass. It images the X-ray sky — black holes feeding, supernova remnants, colliding galaxy clusters — at a resolution nothing else has matched in twenty-five years.

Last heard from
under an hour ago
Goldstone · DSS24

What we have observed

Watching since 2026-08-02.

Elsewhere