Astronomy 101-Chapter 4

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The largest asteroid, and probably the only one to be a spherical "world" is

Ceres.

Which planet by itself contains the majority of mass of all the planets

Jupiter

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

volume

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

moons.

The plane in which almost all planets orbit the sun is called the

ecliptic.

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
sun

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?

jupiter

Which planet has the fewest moons?

mars

Which planet has the highest average density?

earth

Which planet has the lowest average density

saturn

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

comets

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.

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