Read e-book online Asteroid: Earth Destroyer or New Frontier? PDF

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 info for Asteroid: Earth Destroyer or New Frontier?

Example text

Such differences in temperature became important during the formation of planetary bodies, creating very different chemical conditions (and thus different planetary compositions) from the inner to the outer solar system. For example, chemical composition studies give us clues to the reason for the clumping within the original nebula and where certain asteroids and meteorites were formed within the solar system. One way is to analyze specific isotopes, forms of the same elements, but with differing numbers of neutrons (in other words, the atomic number is the same, but the isotopes have a different atomic mass and physical properties).

L. G. Bowell) asteroids). But he was far from the top asteroid discoverer who used photos: German astronomer Karl Reinmuth (Wolf's assistant) discovered 385 asteroids between 1914 and 1957; Russian astronomer Nikolai Cemykh found 377; and, more recently, astronomer Edward L. G. Bowell at the Lowell Observatory has counted 386 to his credit, making him the leading discoverer of asteroids that have been numbered'? Asteroids continued to be discovered throughout the 20th century, with at least one asteroid found by various means (except visually, as Palisa did) every year since 1847, with the exception of 1945, the end of World War II.

The T-Tauri event contributed to the growing Jupiter, which was then responsible for arresting a planet's growth between the orbits of the gas giant and Mars. As the planetesimals were accreting and growing elsewhere in the early solar nebula, several dozen of the larger objects called planetesimals (ranging in size from about 100-1000 kilometers) orbited the Sun near the forming Jupiter. No other region within the solar system had such a formidable planet as Jupiter forming, and thus, no other asteroid belts formed.

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

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