A) leftover chunks of rock from the earliest period in the formation of the solar system.
B) pieces of comets rather than of asteroids.
C) chunks of a larger asteroid that was shattered by a collision.
D) chunks of rock chipped off the planet Mercury.
E) chunks of rock chipped off the planet Mars.
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The difference is that the comets in the...View Answer
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A) There was not enough material in this part of the solar nebula to form a planet.
B) A planet once formed here,but it was broken apart by a catastrophic collision.
C) Gravitational tugs from Jupiter prevented material from collecting together to form a planet.
D) There was too much rocky material to form a terrestrial planet,but not enough gaseous material to form a jovian planet.
E) The temperature in this portion of the solar nebula was just right to prevent rock from sticking together.
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A) surrounding Jupiter
B) along Jupiter's orbit,60° ahead of and behind Jupiter
C) in the center of the asteroid belt
D) on orbits that cross Earth's orbit
E) on orbits that cross Mars's orbit
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A) a streak of light caused by a star moving across the sky
B) a streak of light caused by a small particle from space burning up in Earth's atmosphere
C) a fragment of an asteroid from the solar system that has fallen to Earth's surface
D) a small moon that orbits one of the giant planets
E) a comet that burns up in Earth's atmosphere
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A) The strength of gravity on small asteroids is less than the strength of the rock.
B) Small asteroids have odd shapes because they were all chipped off larger objects.
C) Large asteroids were once molten and therefore became spherical,but small asteroids were never molten.
D) Large asteroids became spherical because many small collisions chipped off pieces until only a sphere was left;this did not occur with small asteroids.
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Meteorites are generally very dark and s...View Answer
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A) 1 km
B) 10 km
C) 100 km
D) 1,000 km
E) 10,000 km
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A) straight behind the comet in its orbit
B) generally away from the Sun
C) perpendicular to the ecliptic plane
D) always almost due north
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A) Pluto's largest moon
B) the largest known asteroid
C) the largest known comet
D) one of the Galilean moons of Jupiter
E) a moon of Neptune
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A layer of clay at this level in the sed...View Answer
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A) in the asteroid belt
B) inside Jupiter's orbit
C) between the orbits of Jupiter and Neptune
D) near the radius at which they orbit today
E) in the Oort cloud
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A) Objects in the asteroid belt are made mostly of rock and metal.
B) Objects in the Kuiper belt are made mostly of rock and metal.
C) Objects in the Oort cloud contain large proportions of ice.
D) Objects in the asteroid belt and Kuiper belt orbit the Sun in nearly the same plane as the planets,but objects in the Oort cloud do not.
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It is probably the result of an impact.T...View Answer
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A) calculate its orbit and predict when it will return.
B) publish a picture of it in an astronomical journal.
C) be one of the first three discoverers who report it to the International Astronomical Union (IAU) .
D) be a well-known astronomer.
E) be and do all of the above
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A) Many but not all orbit the Sun in the asteroid belt.
B) Some are more like loosely bound piles of rubble than solid chunks of rock.
C) Most asteroids are not spherical in shape.
D) If we could put all the asteroids together,they would make an object about the size of Earth.
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Many possible answers;without orbital re...View Answer
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A) Pluto is always much farther from the Sun than Neptune.
B) Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits,which ensures they never come close together.
C) Pluto's orbit never comes anywhere close to Neptune's orbit.
D) Actually,a collision of the two is inevitable within the next billion years.
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