[meteorite-list] NPA 06-01-1973 Lincoln Evening Journal
From: MARK BOSTICK <thebigcollector_at_meteoritecentral.com>
Date: Sat Sep 11 16:59:31 2004 Message-ID: <BAY4-F9wD7VuiSVxy3N000558a0_at_hotmail.com> Paper: Lincoln Evening Journal City: Lincoln, Nebraska Date: Friday, June 1, 1973 Page: 13 Hot Meteorite Find Leads To Smithsonian Study By Gene Kelly If a meteorite fell on your front lawn, would you expect it to be hot or cold? (There's this odd charred spot, about 4 inches in diameter, in the green turf on Gary Smith's lawn at 4701 South 43rd in Lincoln.) "There's no history, among the 2,000 recorded meteorite falls, of one ever burning anything, grass or wood." noted Gunther Schwartz, field station manager of a Smithsonian meteorite recovery project, with Lincoln headquarters. "This one's very odd, if it's a meteorite. There are a few cases of people having seen one impact, varying from slightly warm to the touch, to having a frost coating." Smith probed several inches into the burned circle, came up with a fragment of rock - sort of "dumbbell shaped" he notes - found that it was magnetic and called friends at the University of Nebraska.) It's not in their hands. Dr. Samuel Treves, curator of geology at the NU State Museum, says the lawn spot is "very impressive....this thing had no place to come from but up." he said, toying with the potential meteorite. "It could be a piece from a satellite. Our testing will give us big clues. We'll etch it with acid to see if it has a nickel structure and other meteorite characteristics. Of course, a satellite fragment could contain nickel traces." Dr. Treves noted that this "peculiar chunk must have been tremendously hot, although the impact site doesn't indicate much velocity. Often when people dig immediately in a meteorite impact point they find it full of mud, or only a piece of ice. The thing was so cold that moisture condensed. Or it was so hot it vaporized. The Smiths don't recall any odd noises around their home, meteor-like flashes of light or odd happenings. The so-called "shooting star" in the sky is a meteor. The same object on the ground is a meteorite. Schwartz explains. As the meteor entered the earth's upper atmosphere it burns due to friction. "The ballistics are the same as spacecraft reentry. It's possible that one (meteorite) could land still hot. But it's subcold up there. The meteor glow usually ceases at an altitude of 10-12 miles, and the object free-falls." cushioned by air. Schwartz calls meteors "unguided missiles," explaining that he's been involved in basic research as a meteor astronomer for a decade. He's in charge of a million-square mile prairie network of tracking cameras. At dusk 64 automatic cameras at 16 stations in 7 Great Plains states begin recording meteorite and satellite trails. The reconnaissance project puts some 500 meteors on film each year. But very few survive to become museum pieces, Schwartz rates even one as small as the Smith find " a true meteorite." although he found a 22-pound specimen in 1970 near Lost Creek, Okla., as a result of photos from the prairie network. "Meteors are far more fragile than we thought. They're quite cometary, not as hard as we had supposed. Meteors often have the same orbit as comets and are probably debris left over from comet streams." he said. Another meteor theory is that they are particles of small smashed planets, dating to the formation of this or other solar systems. Received on Sat 11 Sep 2004 04:59:29 PM PDT |
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