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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

Cygnus X-1 A black hole gets heavier June 3, 2021

Uhuru Looking at the universe in a new way December 12, 2020

Cygnus Superbubble Blowing a giant “bubble” in space August 30, 2020

Wilhelm Roentgen Looking “deep” into the universe March 27, 2020

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

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

Featured Images

two views of uhuru

Pioneering Explorer December 12, 2020
Multi-spectral view of Cassiopeia A, a supernova remnant

Brilliant Demise October 26, 2020
X-ray image of light echoes from V404 Cygni

Echoes of a Black Hole August 28, 2019
Artist's concept of Cygnus X-1

Bad Neighbor July 11, 2019

Hot Teacup March 17, 2019
Multiwavelength view of the Crab Nebula, M1

X-Raying a Crab January 7, 2019
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

Polar Rings February 22, 2016
X-ray energy forms expanding rings around the black hole V404 Cygni

Big Gulp Aftermath September 15, 2015