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D - Science - Ch 16

Comets, Asteroids & Meteors

QuestionAnswer
Where do comets originate? Kuiper belt and Oort cloud
Where do asteroids originate? leftover pieces of the early solar system, mostly found between the orbits of Mars and Jupiter
Where do meteoroids originate? comets or asteroids
What size are comets? about as large as a mountain, excluding the tail
What size are asteroids? 3 are more than 300 km across, but most are less than 1 km in diameter
What size are meteoroids? smaller than comets or asteroids
What is the composition of a comet? ice, dust, or small rocky particles
What is the composition of an asteroid? rock
What is the composition of a meteoroid? rock or dust
What are comets? loose collections of ice, dust, and small rocky particles with orbits that are usually very long, narrow ellipses
What are the three main parts of a comet? nucleus, coma & tail
What forms a comet’s tail? gas and dust
How long can a comet's tail be? more than 100 million kilometers long
What are asteroids? rocky objects revolving around the sun that are too small and too numerous to be called planets
Where is the asteroid belt? lies between the orbits of Mars and Jupiter
What happened when one or more asteroids collided with Earth about 65 million years ago? the atmosphere was filled with dust and smoke, which blocked out sunlight around the world and scientists hypothesize that many species of organisms, including the dinosaurs, became extinct
What is a meteoroid? a chunk of rock or dust in space
What is a meteor? a streak of light caused by the burning up of a meteoroid in the atmosphere
What is a meteorite? a meteoroid that has passed through the atmosphere and hit Earth’s surface
Where do meteoroids come from? usually come from comets or asteroids
What caused the craters on the moon? the impact of meteoroids
Created by: lprinke