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A natural object originating in outer space is called a meteoroid while in space, a meteor or shooting star when the impact pressure of entering the Earth's mesosphere atmospheric layer causes it to heat up and emit light, thus forming a bolide, aka fireball, and a meteorite when it survives an impact with the planet surface. Meteorites have also been found on the Moon and Mars. |
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Most meteoroids are fragments of cosmic debris smaller than a grain of sand, so almost all disintegrate and never hit the planet surface.
When a number of meteors apperar to radiate from one point in the sky it is called a “meteor shower”. Notable meteor showers are the annual Perseid in mid-August and the Leonid in November on a 33 year cycle - anticipated in 2032.
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The World of Meterorites astronomy education poster features over 30 pictures of the most photogenic meteorites and interesting specimens; also info on meteorite hunters.
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The Meteor Crater, aka the Canyon Diablo Crater and the Barringer Crater, is about 50,000 years old.
It is believed that the object that created the crater was a nickel–iron meteorite about 54 yards (50 meters) across, which struck the Earth at a speed of several kilometers per second. Impact energy has been estimated at about 10 megatons.
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The Meteorite Impact Craters on Earth astronomy education poster features a table with information about the size, location, types of materials found and features of 177 verified impact craters discovered on earth as of 2008.
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The Meteorite educational astronomy poster features photographs of actual meteorite fragments billions of years old accompanied by detailed descriptions of their composition and discovery sites around the world.
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Comet Shoemaker–Levy 9 broke apart and collided with Jupiter in July 1994, providing the first direct observation of an extraterrestrial collision of Solar System objects.
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Comets Posters
Comets are small bodies of rock, dust and ice that orbit the sun in extreme elliptical trajectories, displaying a coma, or tail, that always points away from the sun.
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Northern Lights, Aurora Borealis
The glow and colorful “curtains” of light known as auroras are caused by electrons colliding with atoms in the upper atmosphere and shaped by the Earth's magnetic field.
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Leonid Kulik
b. 8-19-1883; Estonia
d. 4-12-1942; Nazi prison camp
Leonid Kulik, a Russian mineralogist, lead the first expeditions investigating the Tunguska event, the largest impact event in recorded history (6-30-1908). The meteoroid or comet appears to have burst in the air rather than hitting the surface, this event still is referred to as an impact.
• explorer posters
• Meteorite Hunter: The Search for Siberian Meteorite Craters
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James Van Allen
b. 9-7-1914; Mt Pleasant, IA
d. 8-9-2006; Iowa City
The torus of energetic charged particles (plasma) held in place by Earth's magnetic field were confirmed by the Explorer missions directed by Van Allen, a space scientist at the University of Iowa.
• Van Allen Radiation Belt
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Elements of the Universe
Information about the early universe - "Timeline of the Universe"; 10 photos and descriptions of important astronomers and theorists; all the Messier Objects (110 count) and more ...
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