Asteroids
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Asteroids
Asteroids, Information and Impact Events. Near Earth Misses and Science Information on Asteroids and the Asteroid belt.
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Asteroids, also called minor planets or planetoids, are a class of astronomical object. The term asteroid is generally used to indicate a diverse group of small celestial bodies that drift in the solar system in orbit around the Sun
Asteroids
The first asteroid to be discovered, Ceres, is the largest asteroid known to date and is now classified as a dwarf planet. All others are currently classified as small solar system bodies. The vast majority of asteroids are found within the main Asteroid Belt, with elliptical orbits between those of Mars and Jupiter. It is thought that these asteroids are remnants of the protoplanetary disc, and in this region the incorporation of protoplanetary remnants into the planets was prevented by large gravitational perturbations induced by Jupiter during the formative period of the solar system. Some asteroids have moons or are found in pairs known as binary systems."
Information found at: Wikipedia
Impact Events are caused by the collision of large meteoroids, asteroids or comets (generically: bolides) with Earth and may sometimes be followed by mass extinctions of life.
The most significant recorded impact in recent times was the Tunguska event, which occurred in Siberia, Russia, in 1908. This incident involved an explosion that was probably caused by the airburst of an asteroid or comet 5 to 10 kilometers (3 - 6 mi) above the Earth's surface, felling an estimated 80 million trees over 2,150 square kilometers (830 sq mi). But although the Tunguska event was both spectacular and unparalleled in any historical record, it no longer seems as unique and unusual as it once did. We now know that Earth impacts, including fairly big ones, are happening all the time.
The late Eugene Shoemaker of the U.S. Geological Survey came up with an estimate of the rate of Earth impacts, and suggested that an event about the size of the nuclear weapon that destroyed Hiroshima occurs about once a year. Such events would seem to be spectacularly obvious, but they generally go unnoticed for a number of reasons: the majority of the Earth's surface is covered by water; a good portion of the land surface is uninhabited; and the explosions generally occur at relatively high altitude, resulting in a huge flash and thunderclap but no real damage.
Some have been observed. Noteworthy examples include the Sikhote-Alin Meteorite fall in Primorye, far eastern Russia, in 1947, and the Revelstoke fireball of 1965, which occurred over the snows of British Columbia, Canada. Another fireball blew up over the Australian town of Dubbo in April 1993, shaking things up but causing no harm.
On the dark morning hours of January 18, 2000, a fireball exploded over the town of Whitehorse in the Canadian Yukon at an altitude of about 26 kilometers, lighting up the night like day and bringing down a third of the Yukon's electrical power grid, due to the electromagnetic pulse created by the blast. The meteor that produced the fireball was estimated to be about 4.6 meters in diameter and with a weight of 180 tonnes.
Information found at: Wikipedia
Asteroids
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Asteroids on Amazon
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Asteroids, Information and Impact Events. Near Earth Misses and Science Information on Asteroids and the Asteroid belt on Amazon
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Asteroid Guestbook
Please add some comments about this lens on Asteroids. And please click some gold stars at the top. :-)
Thank-You
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LDWorld Oct 8, 2011 @ 9:08 am | delete
- one of the largest asteroids did land in Tunguska, Russia to my knowledge
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ChrisDay
Apr 25, 2011 @ 1:26 am | delete
- Great lens!
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LeslieBrenner Feb 27, 2008 @ 3:06 pm | delete
- Whoops, I meant gold came from meteorites some 4.6 billion years ago.
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LeslieBrenner Feb 27, 2008 @ 3:01 pm | delete
- Nice lens! I make jewelry and work with gold. Did you know that the gold in your jewelry came from meteorites, circa 46 million years BC?
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Asteroids
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