Scientists may be coming closer to confirming the existence of dark matter - the invisible stuff thought to make up more than a quarter of the cosmos - as they study a diffuse glow of gamma rays near the center of our galaxy.

Everything visible in the universe is made of ordinary matter - from stars and planets to people and hubcaps and tacos. Ordinary matter can be seen in wavelengths from the infrared to visible light and gamma rays, but comprises only about 5% of the universe. Dark matter, which does not absorb or reflect or emit any light, seems to comprise about 27% of the universe, with another mysterious component called dark energy accounting for the remaining roughly 68%.

Scientists are confident that dark matter exists because of its gravitational effects on a grand scale in th

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