Antennae Galaxies - Public Domain

NASA’s Chandra X-ray observatory has found a mysterious X-ray signal that astronomers are speculating could signal the presence of dark matter some 240 million light years away from Earth.

A leading theory, NASA reports, is that the X-rays are a result of decaying “sterile neutrinos,” which are particles that could potentially produce dark matter. Astronomers believe dark matter accounts for 85 percent of all matter in the universe, but dark matter does not emit or absorb light as does the “normal” matter in planets, stars, and galaxies, so its detection is much more difficult.

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