Word: sun
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Dates: during 1970-1979
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...will be gathered by Copernicus, NASA'S orbiting astronomical observatory, and OSO7 (for Orbiting Solar Observatory). The Venus-and Mercury-bound Mariner 10 may be used to take high-resolution TV pictures of the comet, while either Pioneer 6 or Pioneer 8, both of which are orbiting the sun, try to determine the density of the comet's tail by probing it with radio signals...
...initial lap of the first two-planet, photo-reconnaissance flight. After Mariner has swept by Venus in February, using the braking force of that planet's gravity to change course, it will pass next March within 621 miles of Mercury, the tiny, scorched planet closest to the sun...
...intense radiation belts that pack radiation dosages at least 1,000 times the level regarded as lethal for humans, Pioneer passed just 81,000 miles above the multicolored Jovian cloud tops, took color pictures, gathered oth er data and then was hurled by the enormous gravitational pull of the sun's larg est planet onto a course that will eventually carry it out of the solar sys tem, toward the stars - the first object from earth ever to embark on such a cosmic odyssey...
...Jupiter's powerful gravity. During the brief flyby, Pioneer was suddenly hit by ten tiny meteoroids, after a rate of only one hit every 25 days during its journey; this indicated that the Jovian gravitational field scoops up and concentrates the particles as the planet whirls round the sun...
...Kohoutek under virtually constant watch in order to spot any structural changes in the comet as quickly as possible. The astronauts will also lug some of their cameras outside to get the best possible pictures during three space walks-on Christmas Day just before the comet ducks behind the sun, on Dec. 29 after it reappears, and again just before the end of the mission in February...