United Space AllianceSpace ShuttleLaunch Complex 39B, Kennedy Space Center, FL, USA
Space Shuttle Columbia OV-102 | STS-93
Launch window
No countdown — this launch time is not yet known to the minute.July 23, 1999Add to calendar
United Space Alliance's 13th launch · 1st this year · humanity's 4,331st orbital launch attempt
The launch vehicle successfully inserted its payload(s) into the target orbit(s).
Window: Jul 23, 04:31 – Jul 23, 04:31 UTC
Flight preview
STS-93
STS-93 marked the 95th launch of the Space Shuttle, the 26th launch of Columbia, and the 21st night launch of a Space Shuttle. Eileen Collins became the first female shuttle Commander on this flight. Its primary payload was the Chandra X-ray Observatory.
Astrophysics · Low Earth Orbit (LEO)
Crew
Steven HawleyMission Specialist · NASA
Michel TogniniMission Specialist · ESA
Eileen CollinsCommander · NASA
Catherine ColemanMission Specialist · NASA
Jeffrey AshbyPilot · NASA
Booster
No booster details available.
Watch
- STS-93 launch (7-23-99) — 3210andLiftoff
News
Galactic Gems Glisten in New Gallery From NASA’s Chandra
Galaxies are like cosmic gems, each with characteristics including size and shape that make them distinct. A new gallery released today from NASA’s Chandra X-ray Observatory and other telescopes displays a collection of galactic images that showcase this variety. Astronomers put galaxies into three main categories: spirals like our own Milky Way with arms emanating […]
Colorful Collage of Tarantula Nebula
Data from NASA’s Chandra X-ray Observatory, NASA’s James Webb Space Telescope, and NASA’s Hubble Space Telescope combine to reveal a vibrant view of 30 Doradus, or the Tarantula Nebula, in this Aug. 11, 2026, image. Located in the Large Magellanic Cloud, a small neighbor galaxy to the Milky Way about 160,000 light-years from Earth, the […]
NASA Telescopes Create Colorful ‘Craft’ From Nearby Nebula
Like a collage made of layered sheets of colored cellophane, a vibrant new image layers observations of a famous star-forming nebula from NASA space telescopes. The resulting cosmic “craft” reveals new details about the star formation region known as 30 Doradus, or the Tarantula Nebula. Located in the Large Magellanic Cloud, a small neighbor galaxy […]
A New Look – and Sound – for Messier 94
NASA’s Chandra X-ray Observatory unveiled this new look at the galaxy NGC 4736, also known as Messier 94, on June 30, 2026. Messier 94 is a spiral galaxy with a bright inner ring around it, called a starburst ring, where new stars are forming, perhaps fueled by gas driven in the unique oval-shaped structure seen […]
NASA’s Chandra and IXPE Study Pulsar in Lighthouse Nebula
This composite image, released on July 9, 2026, shows the region around a pulsar – a neutron star with a strong magnetic field that spins incredibly fast – within the Lighthouse nebula. The image contains X-ray data from NASA’s Chandra X-ray Observatory in purple, X-rays from NASA’s IXPE (Imaging X-ray Polarimetry Explorer) in blue, and […]
NASA’s Chandra Examines Milky Way at Arms’ Length
A new result using NASA’s Chandra X-ray Observatory shows that the outer spiral arms in the Milky Way galaxy may reach wider than previously thought. This finding may lead astronomers to adjust their understanding of our home galaxy’s structure. A team of astronomers made this discovery by making precise measurements of distances to dust clouds […]
