Three unusually long-lasting stellar explosions discovered by NASA's Swift satellite represent a new class of gamma-ray bursts that likely arise from dying stars hundreds of times larger than the sun.
The Vela pulsar traces out a loopy, hypnotic pattern reminiscent of art produced by a children's toy in this video created with data from NASA's Fermi Gamma-ray Space Telescope.
NASA's Fermi Gamma-ray Space Telescope reveals the first clear-cut evidence the expanding debris of exploded stars produces some of the fastest-moving matter in the universe.