# Astronomy 101 Module 12 Chapter 12

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question
Which of the following statements best describes the size of the largest asteroid, Ceres? Its diameter is a little larger than a quarter the diameter of our Moon. It is smaller than the jovian planets but larger than the terrestrial planets. It is about the size of a terrestrial planet. It is no larger than a typical mountain on one of the terrestrial planets.
Its diameter is a little larger than a quarter the diameter of our Moon.
question
If we could put all the asteroids together, their total mass would be ______. about the mass of Mercury greater than the mass of Earth but less than the mass of Jupiter much less than the mass of any terrestrial planet about the mass of Earth
much less than the mass of any terrestrial planet
question
Why didn't a planet form where the asteroid belt is now located? There was not enough material in this part of the solar nebula to form a planet. The temperature in this portion of the solar nebula was just right to prevent rock from sticking together. There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. Gravitational tugs from Jupiter prevented material from collecting together to form a planet.
Gravitational tugs from Jupiter prevented material from collecting together to form a planet.
question
Gaps in the asteroid belt (often called Kirkwood gaps) are caused by ______. orbital resonances with Jupiter the competing gravitational tugs of Mars and Jupiter tidal forces from the Sun tidal forces from Jupiter
orbital resonances with Jupiter
question
When you see the bright flash of a meteor, what are you actually seeing? a star that has suddenly shot across the sky the flash that occurs when a speeding rock from space hits the ground the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere emission of visible light from a particle that has not yet entered Earth's atmosphere
the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere
question
How can we determine the reflectivity of an asteroid? By where it is located in the asteroid belt. By measuring its mass and radius. By taking a photograph of it. By comparing its brightness in visible light to its brightness in infrared light.
By comparing its brightness in visible light to its brightness in infrared light.
question
In science fiction movies, spaceships are often shown dodging through large numbers of closely spaced, boulder-size objects. Which of the following real things in our solar system would look most like such science fiction dangers? the asteroid belt the atmosphere of Jupiter the rings of Saturn the Oort cloud
the rings of Saturn
question
Suppose you find a meteorite made almost entirely of metal. According to current science, which of the following statements must be true? Your meteorite is a fragment of an object from the Kuiper belt. Your meteorite was blasted off the surface of Mars by an impact. Radiometric dating will show the age of your meteorite to date to the formation of our solar system. Your meteorite is a fragment from the core of a large asteroid that shattered in a collision.
Your meteorite is a fragment from the core of a large asteroid that shattered in a collision.
question
Which of the following objects are probably not located in the same region of the solar system in which they originally formed? Kuiper belt comets Oort cloud comets asteroids of the asteroid belt Pluto
Oort cloud comets
question
Suppose there were no solar wind. How would the appearance of a comet in our inner solar system be different? It would be much brighter in appearance. It would have only one tail instead of two. It would not have a coma. It would not have a nucleus.
It would have only one tail instead of two.
question
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude? It has been on its current orbit for only a very short time compared to the age of our solar system. It has a coma and tail during most of each orbit. It came from the Kuiper belt. It came from the Oort cloud.
It has been on its current orbit for only a very short time compared to the age of our solar system.
question
When we see a meteor shower, it means that _________. you should duck and run for cover to avoid being blasted on the head by a rock from space Earth is crossing the orbit of a comet an Earth-approaching asteroid has recently come very close to our planet the solar wind is unusually strong
Earth is crossing the orbit of a comet
question
Why won't Pluto collide with Neptune? Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits, which ensures they never come close together. Pluto's orbit never comes anywhere close to Neptune's orbit. Actually, a collision of the two is inevitable within the next billion years. Pluto is always much farther from the Sun than Neptune.
Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits, which ensures they never come close together.
question
What is Pluto's moon Charon thought to have in common with our own Moon? It has the same approximate mass. It has the same average density. It probably formed as a result of a giant impact. It has the same basic composition.
It probably formed as a result of a giant impact.
question
Which of the following is not a piece of evidence supporting the idea that Pluto is a large comet of the Kuiper belt? Pluto's orbit is very similar to the orbits of other known Kuiper belt comets. Triton, which must once have orbited the Sun before being captured by Neptune, is significantly larger than Pluto. Pluto grows a coma and a long tail when it is at the point in its orbit closest to the Sun. Pluto is not the largest object orbiting in the region of the Kuiper belt. Pluto's composition appears to match that of other known Kuiper belt comets.