Word: think
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Dates: during 1950-1959
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Placid Space. The best way to think of space as a navigable medium is to imagine the frictionless surface of a calm, glassy pond. Small objects drift across it easily, propelled by feeble forces. Scattered at wide intervals over the mirror surfaces are deep, sucking whirlpools. If a floating leaf drifts close to one of them, it plunges down to the bottom. A self-powered object, say a water insect, that gets sucked into a whirlpool has a terrible time battling back to the surface...
Nobel Prizewinner Harold Urey of the University of California at La Jolla, another leading moon authority, agrees with Kuiper about there being lava on much of the moon's surface, but he does not think that it welled out of a molten interior. Instead, he contends, it was formed on the spot by the energy of great meteors that hit the moon and melted both themselves and the local lunar rock. He thinks that the present surface material may be something like sand or gravel...
Radiation Erosion. The newest and most radical moon theory was developed by British Cosmologist Thomas Gold, now at Harvard. Professor Gold agrees that the moon was pockmarked long ago by large meteors, and it may have been built up entirely by such accretion. But he does not think that the smooth, dark areas that are called maria (seas), because early astronomers thought they were exactly that, are filled with lava. He thinks that they are low places full of fine dust that was removed by a kind of erosion from the moon's highlands. In some places...
...Venusian atmosphere contains carbon dioxide. This information does not mean (as many science-fiction writers seem to think) that Venus under its clouds is covered with lush jungles. Earthside plants need carbon dioxide, but their flourishing presence on earth is the reason why the earth's modern atmosphere contains only a trace of CO2. This abundance of carbon dioxide in the Venusian atmosphere is excellent proof that the planet has no earthlike plants...
...push into space? This question gets many sharply conflicting answers. Some military strategists believe that a U.S. rocket base on the moon, which could never be destroyed by surprise attack, would provide the supreme deterrent to any earth aggressor. Most scientists do not agree. Nor do they think much of the idea of armed satellite bases. They see little reason to shoot from a satellite when a rocket shot from solid ground can hit any target on earth. But satellites may prove to have value as "eyes in the sky" over enemy territory...