In its simplest form, the theory of Terrestrial protoplanet growth supposes that:
A) all the planetesimals in each orbital zone had about the same gravitational pull.
B) all the planetesimals in each orbital zone had about the same chemical composition.
C) all the planets formed in rotating disks of gas and dust around young stars.
D) all the planets of our Solar System formed as the Sun condensed from the interstellar medium.
Question 2The solar nebula theory supposes that:
A) the moons of all the planets were not formed from a nebula.
B) asteroids formed about half a billion years before the formation of the planets' moons.
C) the Sun formed about a billion years before the planets.
D) planets form in rotating disks of gas and dust around young stars.
Question 3The orbits of all the planets of the Solar System are inclined _____ to each other.
A) less than 2 degrees
B) more than 10 degrees
C) less than 8 degrees
D) more than 12 degrees
Question 4Which of the following is true of the near Earth objects?
A) They are at least as big as Earth.
B) Their density is the same as that of Earth.
C) They pose the threat of eventual collision with Earth.
D) Their orbits are the same as those of the planets near Earth.
Question 5Which of the following is true of the Jovian planets?
A) They grew by gravitational collapse.
B) They did not form from the solar nebula.
C) They developed very slowly.
D) They did not undergo differentiation.
Question 6A _____ is a meteor in space before it enters Earth's atmosphere.
A) meteoroid
B) meteorite
C) comet
D) nebula
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