Dark Satellites

Sep 29, 2011 Are there dark matter galaxies orbiting the Milky Way? Sometimes, clues can be hidden in plain site. The key to solving a particular puzzle might simply be clouded by a layer of presumptions that obscure its true import. Such appears to be the case according a recent…

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Cassini-Solstice Titan Flyby

  Sep 28, 2011 A recent close encounter with Titan uncovered more surface anomalies on the haze-shrouded moon. On October 15, 1997 NASA launched the Cassini-Huygens spacecraft atop a Titan IV-Centaur rocket. The six ton payload was the largest deep space mission ever deployed, requiring a seven year journey to…

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Nox Aeterna

Sep 27, 2011 Do so-called “accretion disks” around presumptive black holes generate gamma-rays? “Now it is quite clear to me that there are no solid spheres in the heavens, and those that have been devised by the authors to save the appearances, exist only in the imagination.” — Tycho Brahe…

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Doomsday Delayed

Sep 26, 2011 Comet Elenin, despite fear mongers and media hype, has vanished. Leonid Elenin discovered C/2010 X1 (subsequently named after him) on December 10, 2010. The comet reached perihelion on September 11, 2011 but does not seem to have survived its encounter with the Sun’s electromagnetic fields. Since the…

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New Kid on the Block

M101 (NGC 5457), the Pinwheel Galaxy. Image credit: Donald E. Scott Sep 23, 2011 A new supernova explosion highlights the same old gravity problems. On August 24, 2011 astronomers from the Palomar Transient Factory discovered the first type 1A supernova seen in decades. Type 1A class stellar explosions (or, implosions)…

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Damp Stars

  Sep 22, 2011 Some stars are said to be surrounded by haloes of hot water mixed with carbon dust. According to a recent European Space Agency (ESA) press release, the Herschel infrared space observatory discovered a cloud of hot water surrounding a giant star in constellation Leo known as…

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Old Stories, New Testimonies

  Sep 21, 2011 Were the myths and legends of ancient peoples entertaining fantasies comparable with Harry Potter stories? Or were they efforts to make sense of the world, comparable to the Big Bang and evolution? Or were they e) none of the above? If they were entertainment, why were…

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Shots in the Dark Part Two

Sep 20, 2011 The previous Picture of the Day described several of the many myths that refer to a celestial chain of arrows or a celestial ladder. It asked, how is this theme to be explained? A significant pointer is the realisation that stories concerning the arrow-chain form a subset…

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