This image show how NASA's Fermi Gamma-ray Space Telescope as it orbits our planet every 95 minutes, builds increasingly deeper views of the universe with every circuit. The image compresses eight individual frames, from a movie showing 51 months of position and exposure data by Fermi's Large Area Telescope (LAT), into a single snapshot. The pattern reflects numerous motions of the spacecraft, including its orbit around Earth, the procession of its orbital plane, the manner in which the LAT nods north and south on alternate orbits, and more.

This represents the position and exposure for one particular source, the Vela Pulsar. The image is from the perspective of the LAT so that viewers can imagine themselves as the telescope watching the sky and seeing this source flying in and out your view over time.


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