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Meteoroids, Asteroids and Comets
Terms in this set (23)
what makes up our solar system
sun, planets, moons, asteroid belt, bits/pieces of rock
what is a meteoroid
while in space a meteorite is called a meteroroid
what is a meteorite
small rock or rocky grain that strikes the Earth's surface
what are commonly called dirty snowballs
________________maybe the shattered remains of objects left over from the time when the planets were formed
what shape is an ellipse?
what is called a shooting star
what happens when a meteorite enters Earth's atmosphere?
friction causes them to burn up producing a streak of light
where can you find most of the asteroids
Asteroid Belt...b/w Mars and Jupiter
planets , comets and asteroids all revolve around the sun. the _______________________force of the sun holds everything in a regular rotation pattern
how are meteoroids formed?
pieces of rock that broke off other objects
what is made up of ice, dust, small gritty particles?
Many__________ orginate in region called the Oort cloud and Kuiper Belt
Meteorites/meteroids ...are they dangerous?
Meteorites that reach Earth can be dangerous...example Flagstaff, AZ meteorite hit 49,000 years ago
what is an asteroid?
a irregularly shaped rocky object in space
what is the main difference b/w a meteoroid and asteroid?
Asteroid is larger than meteoroid
a rotation pattern is called a
what are NEA's
Asteroids that corss Earth's orbit are called Near-Earth Asteroids (NEA's)
scientists think that when a asteroid hit 65 million years ago...many animals b/came extinct including______________
what is a Torino Scale
a system used to rate the hazard level of an object moving toward Earth
why do planets/moons with atmospheres have less impact craters than those w/out atmosphere?
the atmosphere slows and burns smaller objects like meteorites...many do not reach the surface to create an impact
bright streaks of light that result when rocky bodies burn up in the atmosphere are called
small rocky bodies that revolve around the sun are called_______________
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