Word: meteored
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Dates: during 1950-1959
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Last week, in the British publication, Nature, Florida State University Physicist Philip J. Wyatt suggested one possible clue: "Of the many craters on the earth known to have been produced by fallen meteors, a few have left no signs of the meteor which caused them, apart from the huge holes created in the earth's crust." Could antimatter possibly have been involved? If so, says Wyatt, "no traces of the meteors would remain, due to the annihilation process." Best example is the huge meteor that blazed over southern Russia on the morning of June 30, 1908. Minutes later...
Physicist Wyatt suggests another search at the site for short-lived radioisotopes, produced by intense gamma radiation, which could prove the point. One theoretical flaw in the argument is that an antimatter meteor ought to explode shortly after whizzing into the earth's atmosphere. Moreover, anti-gravity may be a property of antimatter. Unlike other meteors, which fall into the earth's gravitational field, an antimatter meteor would be repelled. But if antimatter does not have antigravity, an antimatter meteor - if big enough to survive the annihilation of its surface - might hit the earth...
...little satellite "will probably circle the earth over the heads of your grandchildren, and even their grandchildren," for as many as 200 years. Its two radio transmitters are still working fine, and since they get their power from solar batteries, they will broadcast indefinitely until some disaster, e.g., meteor impacts, shuts them down...
...pressure inside it (.2 lb.) is enough to stretch the wrinkles out of the aluminum film and make it mirror smooth. After doing this job, the nitrogen escapes into the vacuum outside. O'Sullivan wants to get rid of it because the balloon may be punctured by a meteor, and a jet of gas escaping from it might push it off its regular orbit...
...fine wires in the Explorer's meteor-detecting grids have been broken, presumably by micrometeorites. The microphone inside the satellite also picked up the impact of an object against the satellite's skin...