Chapter 7 Astro

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How does the Sun’s mass compare with that of the planets?

It is a thousand times more massive than all the planets combined.

Where does nuclear fusion occur in the Sun?

in its core

Which planet has the highest average surface temperature, and why?

Venus, because of its dense carbon dioxide atmosphere

The most metal-rich terrestrial planet is


Which planet, other than Earth, has visible water ice on it?


Pluto is different from the outer planets in all of the following ways except which one?

Its surface temperature is very cold.

Which of the following is farthest from the Sun?

a comet in the Oort cloud

Which of the following observations indicates that conditions on Mars may have been suitable for life in the past?

There are dried-up riverbeds on Mars.

Which planet has a ring system?

Jupiter Saturn Uranus Neptune (ALL OF THE ABOVE)

What is the primary reason why a Pluto flyby mission would be cheaper than a Pluto orbiter?

The fuel needed for an orbiter to slow down when it reaches Pluto adds a lot of weight to the spacecraft.

What is aerobraking?

the technique of using a planetary atmosphere to change the orbit of a spacecraft

Which of the following is not an advantage of spacecraft flybys over ground-based telescope observations?

Spacecraft can monitor changes in a planet’s atmosphere over long times.

Which of the following statements is not an observed pattern of motion in our solar system?

Most planets orbit at the same speed.

Which of the following is not an exception to the general patterns in the solar system?

the rings of Saturn

Which is the densest planet in the solar system?


The planet closest in size to Earth is


Which of the following is not a characteristic of the inner planets?

They all have substantial atmospheres.

Which of the following is not a characteristic of the outer planets?

They have very few, if any, satellites.

What are the main constituents of the jovian planets?

hydrogen and helium

Where are most of the known asteroids found?

between the orbits of Mars and Jupiter

How do asteroids differ from comets?

Asteroids are rocky bodies and are denser than the comets, which are made of icy material.

Based on the frequency with which we see comets from Earth, astronomers estimate the total number of comets in the solar system to be

1 trillion.

Which of the following best describes Pluto in terms of the general characteristics of terrestrial and jovian planets?

size and solid surface similar to terrestrial planets; distance similar to jovian planets

Astronomers have decided that, rather than being a planet, Pluto is really just a large member of

the Kuiper belt.

Which of the following is not a pattern of motion in our solar system?

Planets all rotate in the same direction.

Oceans cover more of Earth’s surface than land.


All four of the giant outer planets-Jupiter, Saturn, Uranus, and Neptune-have rings.


The planet Uranus held a special place in the mythology of the ancient Romans.


All planets orbit the Sun in the same direction (counterclockwise as viewed from above Earth’s North Pole).


All the planets in the solar system have at least one moon.


All comets orbit the Sun in the same direction as the planets.


8) The more massive planets in the solar system tend to be less dense than the lower mass planets.


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