Word: earthly
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Dates: during 1980-1989
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...gravitational embrace, one orbiting the other every 11 1/2 minutes and spewing X rays at a temperature of 50 million degrees Fahrenheit. Says Nicholas White of the European Space Agency's EXOSAT observatory in Darmstadt, West Germany: "What we've got is a system you could fit between the earth and the moon that generates 100,000 times more luminosity than...
...every 11 1/2 minutes, like clockwork, momentarily become more intense. It was the brilliant radiation that enabled EXOSAT, a European X ray- detecting satellite, to find the binary stars, which were hidden from ordinary telescopic view in a globular cluster of stars 20,000 light years away from the earth...
...gravity and then exploded, leaving behind a spinning, tightly packed ball of neutrons. Incredible as it seems, that ball, which is more massive than the sun, is only ten miles or so in diameter and is so dense that a cubic inch would weigh 100 billion tons on earth. Its partner in the celestial dance is a white dwarf, a dying star once comparable in size and mass to the sun that has burned up its fuel and shrunk to about three times the size of the earth. But the dwarf still glows like an ember as it slowly radiates...
Field shared his experience as a member of the Paine Commission, which was established by Congress to assess the future of the U.S. space program over the next 40 years. "The commission could see no reason to limit humanity to the Earth," said Field. "We immediately began talking in terms of settling the solar system...
...North America, the butterflies expanded their range northward to exploit new food supplies, and then began migrating to survive the winter. How the butterflies find their winter hideouts is a conundrum as well. An intriguing theory suggests that, like certain species of birds, the monarchs may respond to the earth's magnetism: the Mexican hideaways surround a large iron-ore deposit, which creates a powerful magnetic field...