Men who see red giants and white dwarfs in the night met 200 strong last week at the Yerkes Observatory, Williams Bay, Wis. Members of the American Astronomical Society, they reported to one another:
> The moon's great craters are extinct volcanoes and not meteoric pockmarks as many scientists have believed. So said Roy K. Marshall of Philadelphia's Franklin Institute. His reasoning: If the moon has no atmosphere at all, a one-inch meteorite traveling 20 miles a second would strike it with an explosion visible from the earth. About 1,000 meteors that size must...
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