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Summer/Fall 1999 Astronomy News

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Meteorite blamed for reservoir mess

SYDNEY, Australia (AP) - An object that crashed into an Australian reservoir was most likely a meteorite the size of a golf ball, officials said Friday. After signs something fell into a reservoir, officials shut off the water supply to the nearby Guyra, 235 miles north of Sydney. Police set up barricades and scientists were called in to investigate. The mystery made national news Thursday and triggered calls to radio talk shows from explanations ranging from a Martian landing to a hoax by mischievous townsfolk. A worker raised the alarm late Wednesday after noticing a path 50 feet long and several feet wide gouged through reeds growing next to the reservoir's dam, police said. Police divers recovered sediment Friday from the reservoir that geologists believe was stirred up by a small meteorite. Police said the meteorite was embedded about 14 feet into soft rock and could not be quickly removed. Officials said radiation levels were normal and the water was not contaminated. Guyra's water supply was later turned back on.

 
Spongelike structures near the Sun's surface

Newly observed by the TRACE satellite (at extreme ultraviolet wavelengths) and the SOHO satellite (in x rays), these structures lie between the 10,000-K chromosphere and the corona at a temperature of several million K. These filamentary structures (dubbed "solar moss" by Lockheed scientists reporting at the AGU meeting) are typically 6000-12,000 miles in size and about 1000-1500 miles above the photosphere, occur at various places around the sun's surface, usually near the footprint of huge coronal loops. The moss blobs seem to be stable for hours but can also change brightness over periods as short as 30 seconds. Thomas Berger of Lockheed said that the new structures may provide information on how the corona gets so hot, an issue that remains one of the great unsolved mysteries of solar physics.