Word: clouding
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...last ten years, Astronomer Tsuneo Saeki of the Osaka observatory (90 miles from Hiroshima) has been keeping an eye on Mars. About 4 a.m. on Jan. 16, he saw a great grey cloud on the face of the red planet. It rose some 60 miles into the air, he estimated, and covered a roughly circular area about 900 miles in diameter. He watched it tensely for 30 minutes; then clouds in the earth's atmosphere cut off the view. When the weather finally cleared, the clouded side of Mars had turned away...
Saeki reported his observation to top astronomers in Tokyo, who hold him in high regard. It was no ordinary Martian cloud, he said, but must be the product of a "terrific explosion." He added that he was not certain that the explosion could be of volcanic origin...
...last week the part of Mars that Saeki had observed was visible from the U.S. Mars Authority Dr. Gerard Peter Kuiper of McDonald Observatory, Fort Davis, Texas, took a good look and saw nothing unusual. He thinks Saeki saw a cloud of ice crystals, not uncommon when Mars is far away from the sun. The "terrific explosion" could not have been volcanic, he said, for Mars is "a played out planet with no volcanic activity." That talk about a bomb? "Irresponsible," said Dr. Kuiper...
Rainmaking, Dr. Langmuir explained, is not a matter of dumping dry ice into any likely-looking cloud. It works only when conditions are absolutely right. Even then the job can be botched by using too much dry ice. An overdose may turn the cloud into ice particles so small that they never fall as rain...
...milk rain from these reluctant clouds, said Langmuir, is to seed the air with particles of silver iodide, on which moisture condenses easily. When enough nuclei are present, snowflakes form on them at a comparatively low level. This condensation releases heat, which makes the air rise faster. The resulting turbulence tears the snowflakes apart. The fragments grow into larger flakes, releasing still more heat. The meteorological "chain reaction" turns the cloud into a violent thunderstorm that dashes torrents of rain on the ground below...