Science
Fermi Gamma-ray Space Telescope
Catalogued as FGRST (GLAST)
Gamma-Ray Observatory · NASA
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Originally called GLAST, renamed Fermi after launch in honor of the physicist who first theorized cosmic rays. Fermi maps the entire gamma-ray sky every three hours, detecting the most energetic photons in the universe from pulsars, black holes, and dark matter annihilation. Its greatest discovery: millisecond pulsars hidden inside globular clusters, previously thought impossible. It also found the 'Fermi Bubbles' — two vast lobes of gamma-ray emission extending 25,000 light-years above and below the Milky Way's core.
Its orbit
- Orbit
- Low Earth Orbitcan appear as a fast-moving star at dawn or dusk
- Altitude
- 310–317 mi (499–510 km)
- Inclination
- 25.6°
- One orbit
- 94.6 minutes15.2 orbits a day
- NORAD ID
- 33053
- Int’l designator
- 2008-029A
- Launched
- 2008
Orbital elements from CelesTrak, as of 22 Sep 2026.
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