Astronomy Module 6 HW
a chunk of space debris that has struck the ground.
A meteorite is
True
A planet's sidereal orbital period can be measured from repeated observations of its location in the sky (so long as Earth's own motion around the Sun is properly taken into account.
true
All Jovian planets have rings around their equators and at least eight moons.
true
All jovians have at least eight moons and equatorial rings.
true
All of the jovian planets rotate more rapidly than any of the terrestrial planets.
true
All planets revolve around the Sun counterclockwise, and most also rotate on their axis counterclockwise.
false
All terrestrial planets have moons.
true
All the jovian planets are beyond the asteroid belt.
true
All the terrestrial planets lie inside the asteroid belt.
spins faster
As the solar nebula contracts due to gravitation, the cloud
true
Asteroids are the densest form of interplanetary debris.
False
Astronomers have not yet been able to detect planets outside our solar system
true
Comets are easier to identify than asteroids when they are close to the Sun.
false
Comets are not actually members of the solar system, but captured by the Sun.
keep spinning
Conservation of angular momentum means that a spinning body tends to
true
Different temperatures within the solar nebula ultimately determined the compositions of the planets and their moons.
False
Due to their great masses, all four Jovian worlds are much denser than the earth.
false
Earth is nearly twice as large as Venus
All terrestrials are more dense than any of the jovians.
How do the densities of the jovian and terrestrial planets compare?
true
In addition to revolving around the Sun counter clockwise, most planets also rotate on their axis counter clockwise.
pieces of terrestrial planets.
In composition and density, the asteroids most resemble:
the Sun
In composition and mass and density, Jupiter is most like:
moons
In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have
true
Interstellar dust grains start the process of condensation in the early solar nebula.
they have natural satellites whose motions can be precisely measured.
Masses of the planets are easiest to determine if:
true
Of all the terrestrial planets, Mercury's orbit is most eccentric and tilted most above the ecliptic.
false
One characteristic of the Terrestrial planets is their extensive moon systems.
True
Our solar system contains more than 100 Kuiper Belt objects larger than 300 km in diameter.
are almost circular, with low eccentricities.
Planetary orbits
true
The Kuiper Belt is a collection of asteroid-sized icy bodies orbiting the Sun beyond the orbit of Neptune.
beyond the orbit of Neptune
The Kuiper Belt is found where in the solar system?
false
The asteroids are very young and appear to made from the same material.
volume
The average density of each planet in the solar system is determined by taking its mass and dividing that by its
size
The difference between a meteoroid and an asteroid is the object's
all have rings around their equators.
The jovian planets
ceres
The largest asteroid, and probably the only one to be a spherical
true
The masses of all the planets combined is about 1% of that of the Sun.
ecliptic
The plane in which almost all planets orbit the sun is called the:
the time it takes to return to the same location in the sky, relative to the Sun.
The planet's orbital period is
their surface features are obscured by their atmospheres.
The rotation periods of Venus, Jupiter, Saturn, Uranus and Neptune are difficult to determine because
True
The solar system contains eight major bodies called planets and thousands of smaller bodies
away from the Sun and becomes longest and brightest at perihelion.
The tail of a comet always points
shape and tilt from the ecliptic
What aspects of the planets orbits are nearly the same for most planets?
growth of an object by the accumulation of matter
What is the process of accretion?
The denser planets lie closer to the Sun.
What is true about solar system densities?
Jupiter, Saturn, Uranus, and Neptune only
Which of the following are the Jovian planets?
asteroids
Which of the following is not icy in composition?
NOT Saturn
Which of these bodies has the lowest density?
Jupiter
Which planet by itself contains the majority of mass of all the planets?
Most planets move in the Earth's equatorial plane.
Which statement about the motion of the planets is incorrect?
true
While most large moons orbit counterclockwise above their planets' equators, the smaller moons often show eccentric or even retrograde orbits, suggesting capture.
