Monday 28 August 2017

Black hole models contradicted by hands-on tests

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Models of black holes that rely upon an assumption made 20 years ago need revision, explain investigators.
via Science Daily
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Galaxy 5 billion light-years away shows we live in a magnetic universe

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A chance combination of a gravitational lens and polarized waves coming from a distant quasar gave astronomers the tool needed to make a measurement important to understanding the origin of magnetic fields in galaxies.
via Science Daily
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A Fleeting Double Eclipse of the Sun

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Last week, for a fraction of a second, the Sun was eclipsed twice. One week ago today, many people in North America were treated to a standard, single, partial solar eclipse. Fewer people, all congregated along a narrow path, experienced the eerie daytime darkness of a total solar eclipse. A dedicated few with fast enough camera equipment, however, were able to capture a double eclipse -- a simultaneous partial eclipse of the Sun by both the Moon and the International Space Station (ISS). The Earth-orbiting ISS crossed the Sun in less than a second, but to keep the ISS from appearing blurry, exposure times must be less than 1/1000th of a second. The featured image composite captured the ISS multiple times in succession as it zipped across the face of the Sun. The picture was taken in a specific color emitted by hydrogen which highlights the Sun's chromosphere, a layer hotter and higher up than the usually photographed photosphere.

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Construction begins for the protoDUNE detectors

Cassini closes in

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Space Science Image of the Week: Cassini is making its final dives between Saturn and its rings before the mission’s grand finale next month
via ESA Space Science
http://www.esa.int/spaceinimages/Images/2017/08/Saturn_s_rings_and_Prometheus