Every 3.4 years, pulsar B1259--63 dives twice through the gas disk surrounding the massive blue star it orbits. With each pass, it produces gamma rays. During the most recent event, NASA's Fermi observed that the pulsar's gamma-ray flare was much more intense the second time it plunged through the disk. Astronomers don't yet know why. This video is public domain and can be downloaded at: ?http://svs.gsfc.nasa.gov/goto?10798 Like our videos? Subscribe to NASA's Goddard Shorts HD podcast: ?http://svs.gsfc.nasa.gov/vis/iTunes/f0004_index.html? Or find NASA Goddard Space Flight Center on facebook: ?http://www.facebook.com/NASA.GSFC? Or find us on Twitter: ?http://twitter.com/NASAGoddard?
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