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Posts Tagged "gamma rays"

Critical Opalescence

Charismatic Megaparticles Might Hint at Dark Matter, and Much Besides

At a lecture I went to some years ago, astrophysicist Trevor Weekes compared garden-variety elementary particles to mosquitoes. They are plentiful and easy to find—indeed, they find you. But ultra-high-energy gamma rays, he said, are like elephants. They are fairly rare, but among the greatest of creatures. They often roam in spectacular habitats. Their sheer [...]

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Observations

Fermi Satellite Tracks Cosmic-Ray Origins Back to Supernova Remnants

Supernova shock wave

The cosmos is full of surprises—not a week goes by without some group of astronomers announcing a perplexing new discovery that upends theory or expectation. But equally important is the difficult and time-consuming research required to firmly pin down what astronomers think they already know. Take, for instance, a new study on the origins of [...]

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