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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
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Clouds Circle Black Holes
20 February 2014 4:45 pm
Once thought to be fog, astronomers are discovering that clouds circle supermassive black holes. After sifting through the last 16 years of records collected by a NASA satellite that measured x-rays emitted from black holes, researchers noticed multiple instances when x-ray signals the satellite logged dimmed for periods of time, they report in the Monthly Notices of the Royal Astronomical Society. The dimming is believed to be caused by a cloud passing and interrupting the signal between the black hole and the satellite.
See more Signal/Noise.