Astronomy 101 Chapter 8; Mastering Astronomy Assignment Review Practice Test.
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Course
Astronomy
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Astronomy
Astronomy 101 Chapter 8; Mastering Astronomy Assignment Review Practice Test.
Observations show that interstellar clouds can have almost any shape and, if they are rotating at all, their rotation is not perceptible. However, the nebular theory predicts that a cloud will rotate rapidly once it sh...
Astronomy 101 Chapter 8; Mastering
Astronomy Assignment Review Practice
Test.
Observations show that interstellar clouds can have almost any shape and, if they are rotating at all,
their rotation is not perceptible. However, the nebular theory predicts that a cloud will rotate rapidly
once it shrinks to a relatively small size. What physical law explains why a collapsed cloud will rotate
rapidly? - CORRECT ANSWER the law of conservation of angular momentum
The nebular theory also predicts that the cloud should heat up as it collapses. What physical law explains
why it heats up? - CORRECT ANSWER the law of conservation of energy
The nebular theory also predicts that the cloud will flatten into a disk as it shrinks in size. Which of the
following best explains why the collapsing cloud should form a disk? - CORRECT ANSWER Colliding cloud
particles exchange angular momentum and, on average, end up with the rotation pattern for the cloud
as a whole.
As you've seen, the nebular theory predicts that a cloud that gives birth to planets should have the
shape of a spinning disk. Which observable property of our solar system supports this prediction? -
CORRECT ANSWER All the planets orbit the Sun in the same direction and in nearly the same plane.
The solar system has two types of planets, terrestrial and jovian. According to the nebular theory, why
did terrestrial planets form in the inner solar system and jovian planets in the outer solar system? -
CORRECT ANSWER Ices condensed only in the outer solar system, where some icy planetesimals grew
large enough to attract gas from the nebula, while only metal and rock condensed in the inner solar
system, making terrestrial planets.
Based on the nebular theory as it explains our own solar system, which of the following should we
expect to be true for other star systems? Check all that apply. - CORRECT ANSWER -Jovian planets
always form farther from their star than terrestrial planets.
-Many extrasolar planets should fall into the terrestrial or jovian categories.
, -Planetary systems should be common.
-Planetary systems should generally have all planets orbiting in nearly the same plane.
Sort the following hypothetical discoveries into the appropriate bins as follows:
Consistent with theory: The statement describes a discovery that we could reasonably expect to find if
the nebular theory is correct.
Not consistent with theory: The statement describes a discovery that would force us to modify or
discard the nebular theory. - CORRECT ANSWER Consistent with theory:
-Beyond its jovian planets, a star has two ice-rich objects as large as Mars.
-A star has 20 planets
-A star is surrounded by a disk of gas but has no planets.
-Of a star's 5 terrestrial planets, 1 has a moon as large as Earth's moon.
Not consistent with theory:
-A star's 4 jovian planets formed in its inner solar system and its 4 terrestrial planets formed farther out.
-All 6 of a star's terrestrial planets have a moon as large as Earth's moon.
-A star's 5 terrestrial planets orbit in the opposite direction of its 3 jovian planets.
-A star has 9 planets, but none orbit in close to the same plane.
Two hypothetical discoveries in Part A deal with moons that, like Earth's moon, are relatively large
compared to their planets. Which of the following best explains why finding 1 planet with such a moon
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