An intriguing hint of a certain type of gamma-ray light at the center of the Milky Way might be a product of elusive dark matter — or it might not be. For the past several years, scientists have debated whether the light is really there, and what it means. Now, researchers are petitioning the management team of NASA's Fermi Gamma-Ray Space Telescope, the observatory that saw the light, to change its observing strategy to determine once and for all whether the signal really exists.
However, even if there are extra gamma-ray photons coming from the center of the galaxy, scientists are a ways from knowing whether the photons were made by dark matter.
Theories suggest some mysterious form of matter that can't be seen or touched is rife throughout the universe, making its presence known only through its gravitational pull. The leading theory behind this dark matter posits that it's made of a new kind of fundamental particle called a WIMP (weakly interacting massive particle). [Graphic: Dark Matter Explained]
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