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- Portrait of a Doomed Asteroid
A new study provides a possible explanation of mysterious X-ray flares detected by the Chandra K-ray Observatory for several years in the region of Sagittarius A*, or Sgr A*. The study suggests a cloud around Sgr A*, a supermassive black hole at the center of our Milky Way Galaxy, which contains hundreds of trillions of asteroids and comets that have been stripped from their parent stars. The flares occur when asteroids of six miles or larger in radius are consumed by the black hole. An asteroid that undergoes a close encounter with another object, such as a star or planet, can be thrown into an orbit headed towards Sgr A*. If the asteroid passes within about 100 million miles of the black hole, roughly the distance between the Earth and the sun, it is torn into pieces by the tidal forces from the black hole. These fragments would then be vaporized by friction as they pass through the hot, thin gas flowing onto Sgr A*, similar to a meteor heating up and glowing as it falls through Earth's atmosphere. A flare is produced and eventually the remains of the asteroid are swallowed by the black hole. Image Credit: Illustrations: NASA/CXC/M.Weiss
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Category Archives: Security
Disaster Retrospective
Here’s an interesting post that the marketing guy over at “The Ready Nation” store put together. A bit of a disaster / readiness retrospective of 2010, on a micro level. People tend to think in terms of hurricanes, tornadoes, earthquakes, … Continue reading
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American Mumbai
Over at Blackfive the team took a look at: It’s worth thinking through the problem this author raises: how would the U.S. handle a Mumbai-like terror attack? It’s an interesting post on how different the US is regionally, and why. … Continue reading
Posted in Security, Self Defense, Society, Terrorism
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Time for a New Secretary?
From reports this morning, Homeland Security Secretary Janet Napolitano looks to have put her foot in it again. In fairness, the quote that is being latched onto is relatively benign. “It’s a big border,” she said. “It’s 1,960 miles across that … Continue reading
Posted in Politics, Security
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