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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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The Countdown

The Countdown, Episode 2: A Mars Party, Star versus Black Hole, Thunderous Gamma Rays, Meteoroid Fireworks, Money for Space Taxis

Story 5 NASA’s Curiosity rover touched down on Mars early Monday morning, setting off a worldwide celebration. Links: NASA’s Curiosity Rover Lands Safely on Mars Video: NASA Lands Car-Sized Rover Near Martian Mountain Curiosity Targets Gale Crater Mars Party of the Decade Reaches Fever Pitch Story 4 Black holes have the size and mass to [...]

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