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X-Ray Astronomy

A very energetic wavelength, or frequency, of light. X-rays are more energetic than ultraviolet light, but less energetic than gamma-ray. They range in wavelength from 10^-8 meters to 10^-12 meters, and in frequency from 10^17 to 10^20 Hz. X-rays can be quite harmful to life because they are strong enough to ionize atoms and thus destroy cells. The Earth’s atmosphere shields us from all astronomical x-ray radiation. X-rays produced by people do have useful applications, however; for example, they are used to help identify broken bones and to treat certain types of cancer.

Radio Programs

Circling Antarctica  A busy summer in Antarctica December 4, 2018

Unlucky Stars Getting too close to black holes September 24, 2018

Black Hole Bonanza Black holes by the hundreds August 31, 2018

Beta Ceti The imprint of a magnetic “fossil” January 12, 2018

Doomed Star A star faces a fate worse than death May 9, 2017

Black-Hole Feast A black hole feasts on a big star April 26, 2017

Vela X-1 A giant X-ray machine in the sky September 19, 2016

Scorpius X-1 Diagnosing a dead star July 22, 2016

Herbert Friedman Watching the Sun with a “rockoon” June 21, 2016

Waking Up A black hole wakes up hungry September 14, 2015

Featured Images

Black holes around a ring galaxy

Ring Around the Galaxy September 8, 2018

X-ray view of Cassiopeia A

It's Elemental January 2, 2018

The Crescent Nebula

Colorful Demise December 14, 2017

Multi-wavelength view of NGC 6946, the Fireworks Galaxy

Fireworks Factory August 23, 2017

Artist's concept of 47 Tucanae X9, a likely black hole-white dwarf binary

Living Dangerously March 16, 2017

NICER X-Ray Telescope Attached to International Space Station

A 'Nicer' View of the Sky February 21, 2017

X-Ray image of VLA J2130+12

Slow Eater December 15, 2016

Auroras on Jupiterk