Rank 34 documents the Chandra X-ray Observatory — the third of NASA's Great Observatories, launched 23 July 1999 aboard Space Shuttle Columbia on STS-93 with a mirror assembly so precise it resolves half an arcsecond in wavelengths opaque to ordinary optics. Marshall Space Flight Center and the Smithsonian Astrophysical Observatory inherited Riccardo Giacconi's X-ray astronomy legacy, deploying a 4,790 kg observatory into a highly elliptical 10,000 × 140,000 km orbit after an underburn that controllers corrected through ingenious trajectory design. ACIS and HRC detectors have since mapped black hole accretion disks, supernova remnant chemistry, and galaxy cluster physics for a quarter century. Heritage Collector renders Columbia deploying Chandra against Earth limb and Crab Nebula inset exactly as the master PNG dictates.