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Comets, Meteors, and Asteroids
Comets, Meteors, and Asteroids

... asteroids, even if they were there at one time. ...
handout 8 - Research 2
handout 8 - Research 2

... The sun’s mean equatorial radius (the distance from its geometric center to the surface) is 695,500 km. The earth’s mean equatorial radius is 6,378.14 kilometers. ...
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... - They are named after the two horses that pulled Mars’ chariot. - They are only 10 and 17 miles across and are thought to be “captured asteroids.” The Asteroid Belt: - A rocky space object, which can be from a few hundred feet to several hundred km wide. Most asteroids in our solar system orbit the ...
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... • Venus- hottest (thick atmosphere), “Earth’s twin” (size), retrograde rotation (East to West) • Earth- life, H2O • Mars- red, dust storms ...
The Origin of the Solar System
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... Orbits generally inclined by no more than 3.4o Exceptions: Mercury (7o) ...
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... • Some ray material from Copernicus is less than 1 billion years old. • Integrating these ages into the relative scale allows the development of an absolute scale. ...
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Asteroids comets meteoroids

... Near-Earth Asteroids “NEA” Asteroids whose orbits bring them close to earth. – More than 1,000 – Possible dangers to earth – Example: Meteor crater, Arizona 50 m asteroid 1 km crater 40,000 years ago • NASA has a congressional mandate to catalog all near-Earth objects. ...
Ancient Mathematics 450 B.C. 400 B.C. 350 B.C. 300 B.C. 250 B.C.
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... 6. Close study of long period comets show them to be from the Oort Cloud. Compare how fast those comets would be moving while in the cloud and while moving near the sun with the speed of Earth’s orbit. ...
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... boulders and becoming terrestrial planets. The same process occurs beyond the frost-line, but the baby planets become larger here due to the vast amounts of condensed ices. They become large enough to capture gas from the nebula, forming their own mini-nebulas and eventually forming the jovian plane ...
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NOTES April 21, 2008 Earth Science – 6th Grade Mrs. Elliott
NOTES April 21, 2008 Earth Science – 6th Grade Mrs. Elliott

... radiation that may briefly outshine an entire galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun could emit over its life span.[1] The explosion expels much or all of a star's material[2] at a velocity of up to a ...
other objects in solar system
other objects in solar system

... • Approximately 65 million years ago an asteroid the size of a mountain struck Earth the result was a catastrophic change to Earth’s atmosphere. Some scientists hypothesize that these changes are responsible for global mass extinctions of thousands of species, including the dinosaurs. • Approximate ...
< 1 ... 366 367 368 369 370 371 372 373 374 ... 385 >

Late Heavy Bombardment



The Late Heavy Bombardment (abbreviated LHB and also known as the lunar cataclysm) is a hypothetical event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, corresponding to the Neohadean and Eoarchean eras on Earth. During this interval, a disproportionately large number of asteroids apparently collided with the early terrestrial planets in the inner Solar System, including Mercury, Venus, Earth, and Mars. The LHB happened after the Earth and other rocky planets had formed and accreted most of their mass, but still quite early in Earth's history.Evidence for the LHB derives from lunar samples brought back by the Apollo astronauts. Isotopic dating of Moon rocks implies that most impact melts occurred in a rather narrow interval of time. Several hypotheses are now offered to explain the apparent spike in the flux of impactors (i.e. asteroids and comets) in the inner Solar System, but no consensus yet exists. The Nice model is popular among planetary scientists; it postulates that the gas giant planets underwent orbital migration and scattered objects in the asteroid and/or Kuiper belts into eccentric orbits, and thereby into the path of the terrestrial planets. Other researchers argue that the lunar sample data do not require a cataclysmic cratering event near 3.9 Ga, and that the apparent clustering of impact melt ages near this time is an artifact of sampling materials retrieved from a single large impact basin. They also note that the rate of impact cratering could be significantly different between the outer and inner zones of the Solar System.
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