Gamma‑Ray All-Sky Map

Fermi Gamma-ray Space Telescope in orbit - Courtesy NASA
Fermi gamma-ray space telescope 
Courtesy NASA

Launched into orbit on June 11, 2008, the Fermi Gamma-ray Space Telescope (formerly GLAST) is our newest major space observatory.  Fermi views the Universe through high-energy gamma rays.  Being able to detect and correlate gamma rays gives us exciting images of unprecedented detail that enable us to render vivid false color representations. 

This image from Fermi shows an all‑sky map.  The map is based on galactic coordinates gathered from an accumulation of data over one year of observations.   Every orbit during the year added another layer of information.

The bright band across the center of the image is a "sideways" view of emission from our Milky Way galaxy.  The emission is created when charged particles known as cosmic rays smash into the tenuous gas between the stars.

Individual strong sources of gamma‑ray emission are also visible in the image, including rotating collapsed stars known as pulsars, and jets from super‑massive black holes in the cores of distant galaxies.  Gamma-rays are often generated by violent, energetic events.  Most of the cosmic gamma rays that we see from pulsars and black holes are created when very strong magnetic or gravitational fields accelerate charged particles to very high energies.

Fermi One Year All-Sky Map
Image Credit: NASA/Dept of Energy/International Fermi Large Area Telescope Collaboration


Gray arrow  12 Month All-Sky Map (Larger Image)
Gray arrow  Annotated 3 Month All-Sky Map
Gray arrow  Annotated All-Sky Map Key
Gray arrow  Videos: The Fermi/GLAST Project

Gray arrow  All APS Physics Images