Physical Science Chapter 15

What is the outermost planet?

Neptune

The "sister" planet to Earth is

Venus.

The distance from Earth to the Sun is called a (an)

astronomical unit.

How many moons orbit Mars?

two

The density of Jupiter is

25 percent that of the density of Earth.

The mass of the Sun is how much larger than all of the other planets, moons, asteroids, and other bodies in the solar system?

700 times larger

What separates the terrestrial planets from the giant planets?

Asteroid belt

What feature on Mars was considered by some to be evidence of life on Mars?

Channels or canals

Callisto, Europa, Gannymede, and Io are

Galilean moons.

Which of the following is most likely found on Jupiter?

Hydrogen

Which of the following planets probably still has its original atmosphere?

Jupiter

What is the largest planet in our solar system?

Jupiter.

The day on which planet is about the same time period as a day on Earth?

Mars

The planet that has the shortest "year" among the eight planets is

Mercury.

The planet that is not a giant is

Mercury.

The planet that was named after the mythical Roman messenger of speed is

Mercury.

What planets are considered "twins"?

Neptune and Uranus

Mars has a distinct surface feature-related regions. Which of the following is not such a region?

Ocean floors

Area of the solar system where long-period comets originate is the

Oort cloud.

The only moon in the solar system with a substantial atmosphere is

Titan.

Which of the following planets would be mostly composed of hydrogen, helium, and methane and have a density of less than 2 g/cm3?

Uranus

A day of which planet is longer than a year on that planet?

Venus

What planet is called the morning star and the evening star, depending on its position with respect to the Sun?

Venus

On Venus, the sun rises in the west. This is so because

Venus rotates in the opposite direction of its revolution.

The metallic hydrogen that surrounds the core of Jupiter is not

a gas.

The Great Red Spot is thought to be

a high-pressure region with high cold clouds.

The belt of asteroids between Mars and Jupiter is probably

clumps of matter that condensed from the accretion disk but never got together as a planet.

The small body with a composition and structure closest to the materials that condensed from the accretion disk is a (an)

comet.

Saturn's rings are thought to be

composed of thousands of particles of various sizes.

Venus "shines" because it is

covered with clouds that reflect sunlight.

Venus appears the brightest when it is in the

crescent phase.

Planets in our solar system are classified according to all of the following characteristics except

inhabitants.

Meteorites are classified into the following groups except

lead.

Short-period comets have orbital periods of

less than 200 years.

A shooting star is a (an)

meteor.

A small body from space that falls on the surface of Earth is a

meteorite.

Remnants of comets and asteroids found in space are called

meteoroids.

The most widely accepted theory on the origin of the solar system is

protoplanet nebular.

Jupiter radiates twice as much energy as it receives from the Sun because of

slow gravitational compression of the planet.

The planet with the lowest average density, which is less than that of liquid water, is

Saturn.

What type of planets are Mercury, Venus, Earth, and Mars?

Terrestrial planets