Word: vapor
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...environments. First it must face life on Earth, snuggled by gentle gravitation and sheltered by the atmosphere. So careful are its guardians to keep it clean and uncontaminated, they even dress like medical men and work in an antiseptic, hospital-like atmosphere. While the spacecraft resists corrosion from water vapor and the sea-salted air of Cape Canaveral, anxious humans are always around to protect it; it gets what energy it needs through a bundle of wires called an umbilical cable. This sheltered period is comparable to a baby's gestation in its mother's womb...
Heat Balance. Once Mariner was safely on its way, Physicist Pickering and his JPL teammates watched over their creation like anxious parents. There was so much that could go wrong. Materials that are well behaved in the atmosphere may be useless in space. Even some metals turn to vapor and must be used with caution. Another peril is heat. Space itself has no temperature (having no matter that can be hot or cold), but each object in space assumes a temperature that depends on the balance between the radiation that it absorbs and the radiation that it emits...
...dark, and finally the sunlit side. The microwave radiometer reported a surface temperature of about 800° F. (melting point of lead: 621.5° F.), which seems to vary hardly at all over the whole planet, dark side as well as light side. It showed no detectable water vapor...
...powerfully attractive substance from filter paper crawled over by virgin females, but it was mixed up with too many other materials to be analyzed successfully. The Beltsville system is better; the air passing through the cans carries the cockroach perfume to a flask cooled by Dry Ice. There the vapor condenses and is periodically collected. After an elaborate purification process, Dr. Yamamoto has saved up 12.2 milligrams (.0004 oz.) of pure attractant, equivalent to the perfume produced by 10,000 virgin females advertising themselves over a nine-month period...
Besides recording temperatures the probe may also disclose the presence of water vapor on Venus...