Meteors form when larger objects collide in space, creating dust. Most meteors you see in the sky are no larger than a grain of sand. They go fast for the same reason we are traveling so fast...the gravity of the sun and our proximity to it. (you orbit slower the farther you get away from it)
2007-04-02 11:39:38
·
answer #1
·
answered by star2_watch 3
·
0⤊
0⤋
Meteoroid
A meteoroid is a small sand to boulder-sized particle of debris in the Solar system. The current official definition of a meteoroid from the International Astronomical Union is "A solid object moving in interplanetary space, of a size considerably smaller than an asteroid and considerably larger than an atom or molecule." The Royal Astronomical Society has proposed a new definition where a meteroid is between 100 µm and 10 m across. Larger than that, the object is an asteroid; smaller than that, it is interplanetary dust.
Meteor
A meteor is the visible event that occurs when a meteoroid enters the earth's atmosphere and becomes brightly visible. For bodies with a size scale larger than the atmospheric mean free path (10 cm to several meters) the visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry. Since the majority of meteors are from small sand-grain size meteoroid bodies, most visible signatures are caused by electron relaxation following the individual collisions between vaporized meteor atoms and atmospheric constituents.
2007-04-02 18:48:24
·
answer #2
·
answered by Anonymous
·
0⤊
0⤋
Meteoroids are objects in space that have the potential to strike the Earth. Meteorites are objects that have survived the passage through the atmosphere and have struck the Earth's surface.
Meteors are objects in transit through the Earth's atmosphere. They form from meteoroids as they encounter the Earth's atmosphere and are slowed down by it due to forces of friction. Often the friction causes them to heat up as the energy of momentum is converted to heat and light when the speed is diminished. Thus, we see the light and less frequently a sonic boom as the object gets closer to the surface of the Earth. To be absolute...any object falling through the atmosphere is considered a meteoric object...hence snowflakes, raindrops, hailstones, sleet, and the like are studied in meteorology. Rocks from outer space are part of the science of meteoritics.
They go so fast because of the gravitational attraction of the Earth. In outer space there is little or no air to slow them down, so they often reach great speeds before they encounter the atmosphere. Many reach sub-thermal speeds before hitting the ground and can be cool to the touch before impact. Very tiny ones may just float down to the surface as meteoric dust.
2007-04-02 19:47:05
·
answer #3
·
answered by Bruce D 4
·
0⤊
0⤋
Meteors form as asteroids in the asteroid belt and sometimes beyond that area. They're usually giant pieces of ice, dust, and sometimes iron ore or other metal. They move slowly in space, but when they reach the atmoshpere,they speed up, occasionaly burning up before they hit the surface of our dear planet.
2007-04-02 18:45:58
·
answer #4
·
answered by comicfreak33 3
·
0⤊
0⤋
They're just rocks and dust left over after the planets and their moons formed. They have their own speed through space and then the speed of the earth usually gets added to theirs.
2007-04-02 18:41:00
·
answer #5
·
answered by Gene 7
·
0⤊
0⤋