Word: dust
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Dates: during 1960-1969
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...infra-red recordings also seem to rule out the theory that comets are composed primarily of ice and dust. Ikeya-Seki's high temperatures could have occurred only if it contained large amounts of metallic material. Most of the comet's lighter-weight chemical elements were probably boiled away during a previous close approach to the sun. The scientists also measured the total amount of energy Ikeya-Seki radiated before and after it swung around the sun; they calculated that it lost 65% of its mass and broke into two pieces...
...that the hobby, which often proved fatal, would be safe as well as fun. Eight years ago, the N.A.R. estimates, homemade rockets were killing or maiming one out of every seven kids and laymen attempting to mix fuel and fire a backyard bird. Explosive mixtures of sulphur and zinc dust blinded and burned dozens of people; lead pipes packed with match heads blew up like shrapnel in the inventors' faces...
...ever-polite cross-questioning in the squeal room. Not so on Felony Squad. "On our show the viewers will see the crime committed, so they know the guy's guilty. That way, nobody gets upset when we shoot him." Most often the TV crook will bite the dust in the usual gunfight finale, but on occasion he may die in an auto crash or fall to his death from a tower or cliff. In short, the good guys will still be beating the bad guys-at least...
...find that the West had already been won. Undaunted, he set out to become the chronicler of the cavalryman in action, and Cody obligingly let him use the cowboys and Indians in his Wild West show as models. The results may have been at times secondhand-and his dust-raising dramas clearly anticipate the modern Western-but such paintings as The Summit Springs Rescue, glorifying Cody's role in a much disputed battle, so impressed another Wild West fancier, Theodore Roosevelt, that he gave Schreyvogel a presidential permit to visit any Army post or Indian reservation...
Surrounding the "nucleus" is a vast expanse of dust particles, which could be as huge as 100,000 miles across. The tail is similar in structure, and may be as long as 200 million miles, although some comets have almost no tail...