Gamma rays

Surprise! Classical Novae Produce Gamma Rays

by Shannon Hall July 31, 2014

Want to stay on top of all the space news? Follow @universetoday on Twitter In a classical nova, a white dwarf siphons material off a companion star, building up a layer on its surface until the temperature and pressure are so high (a process which can take tens of thousands of years) that its hydrogen […]

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Observing Alert: Distant Blazar 3C 454.3 in Outburst, Visible in Amateur Telescopes

by Bob King June 24, 2014

Have an 8-inch or larger telescope? Don’t mind staying up late? Excellent. Here’s a chance to stare deeper into the known fabric of the universe than perhaps you’ve ever done before. The violent blazer  3C  454.3 is throwing a fit again, undergoing its most intense outburst seen since 2010. Normally it sleeps away the months around […]

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Weekly Space Hangout – January 10, 2014: Wake Up, Rosetta! & Top Stories from AAS

by Fraser Cain January 10, 2014

Host: Fraser Cain Guests: David Dickinson, Amy Shira Teitel, Scott Lewis, Brian Koberlein, special guest Ruth McAvinia from the ESA This week’s stories: Ruth: Wake up, Rosetta! Facebook link to contest David: AAS-Gamma Ray Gravitational Lens AAS-Death by Black Hole Antares Launch Remote Deployment of Cubesats Venus at Inferior Conjunction Scott: Learning tools for visually […]

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Navy Researchers Put Dark Lightning to the SWORD

by Jason Major June 13, 2013

Discovered “by accident” by NASA’s Fermi Gamma-ray Space Telescope in 2010, dark lightning is a surprisingly powerful — yet invisible — by-product of thunderstorms in Earth’s atmosphere. Like regular lightning, dark lightning is the result of a natural process of charged particles within storm clouds trying to cancel out opposing charges. Unlike normal lightning, though, […]

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Bright Blazar’s Emission Defies Explanations

by Tammy Plotner April 18, 2013

When it comes to sheer wattage, blazars definitely rule. As the brightest of active galactic nuclei, these sources of extreme high-energy gamma rays are usually associated with relativistic jets of material spewing into space and enabled by matter falling into a host galaxy’s black hole. The further away they are, the dimmer they should be, […]

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