Odd X-ray Signal Might be Sign of Dark Matter Strange X-ray emissions from galaxy clusters– hundreds of galaxies connected to each other by gravity–are providing clues about mysterious dark matter. Dark matter–if it really does exist–is thought to be invisible, doesn’t produce or attract light, and makes up a majority, 84.5 percent, of the matter … Continue reading Science Scanner: Curiosity’s Mars Selfie, Jurassic Caterpillar & an X-ray of Dark Matter?