Word: thrusted
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Dates: during 1970-1979
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Until now all space probes have been powered entirely by chemical rockets. Though they can develop enormous thrust, they are voracious consumers of fuel. In only nine minutes, the Saturn 5 moon rockets burned up 3,000 tons of liquid fuel. With such propellants, even larger rockets and exorbitant amounts of fuel would be needed to rendezvous with fast- moving objects like comets, which travel at 198,000 km (124,000 miles) per hour in the vicinity...
...economical. With electricity generated by solar panels, it strips electrons off the atoms of vaporized mercury passing through a coffee-can-like chamber, converting them to ions. Expelled at high speeds in a focused beam, the charged particles act like a rocket exhaust, propelling the craft forward. Though its thrust is minuscule and far too feeble to lift payloads from the earth, the ion engine performs efficiently in the vacuum of space. It can function for years because it draws on solar energy and uses fuel sparingly. It can be stopped and restarted countless times and accelerate spacecraft to extremely...
...released only some of the documents Diamond requested under the Freedom of Information Act. When Diamond asked the Harvard Archives for papers relating to the seminar, librarians thrust at him the Harvard "50-year-rule," a University regulation that prohibits public viewing of administrative records until 50 years after they were printed...
...obligations. But just how well the Pentagon would be able to carry out its awesome responsibilities is a matter of growing concern in Washington. Both in the Administration and in Congress, officials confront a question that will not go away: Could the U.S. successfully counter a major Soviet military thrust, no matter where it came? If the answer seems doubtful, then the next question inevitably is: What must be done to ensure the nation's security...
...Catholic guerrillas. Said he: "I don't believe they should do things that way because violence begets violence." The cardinal and other church leaders also fear that a witch hunt by the government could divide the church. Army commanders, in fact, have threatened to root out "the subversive thrust of religious radicals." So far, the regime has refrained from making any arrests, perhaps out of concern that just as violence can beget more violence, so repression can breed radicalism...