Light in the Dark

Scientists may be on the brink of identifying a mysterious form of matter

By Tom Siegfried, 22:40 PM December 26, 2012

For decades, astronomers have grappled with their inability to decipher the universe’s darkest secret: the identity of most of its matter.

It’s not the same stuff as the ordinary atomic variety of matter common on Earth. Atoms or their parts — such as protons and neutrons — make up less than 17 percent of the mass in the cosmos. All the rest is “dark” — invisible to eyes and telescopes, its presence deduced by its gravitational tug on stars and galaxies (SN: 8/28/10, p. 22). This mystery ma...

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