Chapter 6 Astr 101

Flashcard maker : Ben Stevenson
_____is the only planet with a mean density less than water.
Saturn
By itself, ________ makes up 70% of the masses of all the planets combined.
Jupiter
________ is the planet with the slowest rotation period.
Venus
The planet’s orbital period is:
the time it takes to return to the same location in the sky, relative to the Sun.
Which of these spacecraft went into orbit about Saturn in July 2004?
Cassini
The “Grand Tour” of all four jovians was conducted by:
Voyager 2.
What aspects of the planets orbits are nearly the same for most planets?
shape and tilt from the ecliptic
All the jovian planets lie beyond the asteroid belt
True
Of all the terrestrial planets, Mercury’s orbit is most eccentric and tilted most above the ecliptic
True
In addition to revolving around the Sun counterclockwise, most planets also rotate on their axis counterclockwise.
True
The principal difference between the terrestrial and jovian planets is the absence of ________ and helium close to the Sun.
Hydrogen
Which of the following are the jovian planets?
Jupiter, Saturn, Uranus, and Neptune only
In composition, mass, and density, Jupiter is most like:
the Sun.
Which of the characteristics below describes the terrestrial planets?
possessing weak magnetic fields
Which characteristic listed below describes the jovian planets?
low density
The jovian planets:
all have rings around their equators.
All terrestrial planets have moons.
False
All of the jovian planets rotate more rapidly than any of the terrestrial planets.
True
All jovians have at least eight moons and equatorial rings.
True
Most asteroids are found:
between the orbits of Mars and Jupiter.
The Kuiper Belt is found where in the solar system?
beyond the orbit of Neptune
The difference between a meteoroid and an asteroid is the object’s:
size.
The smallest sort of interplanetary matter is called:
interplanetary dust.
Which of the following is NOT icy in composition?
asteroids
A meteorite is:
a chunk of space debris that has struck the ground.
Comets are easier to identify than asteroids when they are close to the Sun.
True
Comets are not actually members of the solar system, but captured by the Sun.
False
In general, the surfaces of the planets will be ________ than the age of the solar system.
younger
The ________ theory describes the origin of the planets as having been formed by accretion of small particles into progressively larger and larger bodies.
Condensation
As the solar nebula contracts due to gravitation, the cloud:
spins faster
In light of modern solar system theory, why do the orbits of the planets all lie in the same plane?
The early solar nebula flattened into a disk
What factor caused different planets to form out of different types of material?
The variation in temperature throughout the solar nebula; the higher the temperature, the lower the percentage of light elements in the forming planet.
As the solar nebula contracts it:
spins faster due to conservation of angular momentum
Any model of solar system formation must explain why the planets revolve in the same direction as the Sun rotates.
True
Any model of solar system formation must explain why every planet is relatively isolated in space.
True
The asteroids are very young and appear to be made from the same material.
False
What might have made the original solar nebula begin to contract?
the shock wave from a nearby exploding star
As a result of the ejection of planetesimals into the Oort Cloud, simulations indicate that Uranus and Neptune moved:
further from the Sun

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