46 terms

Astronomy 101-Chapter 4

The largest asteroid, and probably the only one to be a spherical "world" is
Which planet by itself contains the majority of mass of all the planets
Our understanding of the solar system has come in a way that can best
be described as:
explosive, with us learning more in the past few decades than in all
previous history
What is the goal of comparative planetology?
to determine the origin and evolution of the solar system
What is true about solar system densities?
The denser planets lie closer to the Sun
The planet's orbital period is:
the time it takes to return to the same location in the sky
Masses of the planets are easiest to determine if:
they have natural satellites whose motions can be precisely measured
The average density of each planet in the solar system is determined by
taking its mass and dividing that by its
Which of these bodies has the lowest density?
E) Saturn?
In order to determine the mass of a planet by applying Newton's laws of
motion and gravity, the planet must have
The plane in which almost all planets orbit the sun is called the
The orbits of the planets are NOT:
are almost parallel to one another (like sheets of paper one on top of
each other)?
The planets orbit the sun because:
the force of gravity attracts the planets towards the sun
The (orbital) period of a planet is:
the time for one complete revolution of the planet around the
The mass of a planet is determined using:
Newton's laws of motion and gravity, combined with the (orbital)
period of the planet
How do the densities of the jovian and terrestrial planets compare?
All terrestrials are more dense than any of the jovians.
Which ordering of planets by INcreasing distance from the sun
is NOT correct:
venus, mars, neptune, uranus
What are the bodies between Mars and Jupiter
(sometimes called the "failed planet"):
the asteroids
Of all the planets the earth is UNIQUE in having:
substantial oxygen in it's atmosphere and liquid water on it's surface
The earth has:
fewer moons than Jupiter?
Viewed from the side (and at a great distance from the sun) the planet
orbits are
lie almost in one plane
c) lie very close to the "ecliptic?
What is the most massive object in the solar system?
the sun
Most of the orbits of the asteroids are between the orbits of:
mars and jupiter
Most of the time comets "live" between the orbits of:
none of these?
Which planet has the most moons?
Which planet has the fewest moons?
Which planet has the highest average density?
Which planet has the lowest average density
The "Manicouagan resevoir" and the "Arizona Meteor Crater" are
the results of
extremely infrequent (less than once per ten thousand years)
meteor impacts
Meteors that reach the surface of the earth are called:
a meteorite
Which of the following are the Jovian planets?
Jupiter, Saturn, Uranus, and Neptune only
In composition and mass and density, Jupiter is most like:
the Sun.
Which characteristic listed below describes the jovian planets
low density
The jovian planets
all have rings around their equators.
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
In composition and density, the asteroids most resemble
pieces of terrestrial planets.
In composition, asteroids and meteoroids are most like
terrestrial planets
The difference between a meteoroid and an asteroid is the object's
location in the solar system.
The smallest sort of interplanetary matter is called
interplanetary dust.
The most detailed look we've had of an asteroid comes from
spacecraft sent to an asteroid
The Kuiper Belt is an "outer asteroid belt" consisting of what types of
solar system bodies
icy cometlike bodies
Which of the following have an icy composition
A meteorite is
a chunk of space debris that has struck the ground
The tail of a comet always points
away from the Sun and becomes longest and brightest at perihelion
As the solar nebula contracts due to gravitation, the cloud
spins faster.