Download e-book for iPad: Asteroid: Earth Destroyer or New Frontier? by Patricia Barnes-Svarney

By Patricia Barnes-Svarney

ISBN-10: 0306454084

ISBN-13: 9780306454080

ISBN-10: 1489961488

ISBN-13: 9781489961488

A examine the production and composition of asteroids and the scary eventuality of a collision with the earth.

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Additional resources for Asteroid: Earth Destroyer or New Frontier?

Example text

In the first 30 minutes, all the matter in the universe consisted of about 75 percent hydrogen and 25 percent helium. • At 300,000 to 500,000 years later (the time is debated, as to be expected), the first true, complex atoms formed. • And finally, several hundred million to a billion years later, gaseous clouds of hydrogen and helium began to condense into protogalaxies and stars (which formed first has recently been debated).! What is the best evidence for the Big Bang? First, galaxies are apparently moving away from each other, indicating that the universe is expanding-what is to be expected if such an "explosion" of energy, space, time, and matter occurred.

Palisa's sheer determination has to be admired. Asteroidal searches were exhausting and inefficient. If a star was not found on a chart, it became suspect as an asteroid. And the only way to prove the existence of an asteroid was to detect its motion, which sometimes took months to verify. In all, the total number of known asteroids reached 100 by 1868,200 by 1879, and 300 by 1890. As the discovery of asteroids began to slow down, a new technique helped to boost the numbers once again: Photography was introduced into astronomy.

What Penzias and Wilson heard in their receivers was not artificial background noise-or even pigeon droppings on the dish, as they speculated. The everpresent noise, coming from all directions, turned out to be the "echo" (more like a whisper now) of the Big Bang-a reflection of the radiation released from the initial expansion of the universe. ) Not everyone assumes that the Big Bang occurred. Probably more than any other model, the steady state model is the most contrary, mainly because it radically counters the idea of the Big Bang.

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Asteroid: Earth Destroyer or New Frontier? by Patricia Barnes-Svarney

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