The Planets by Gail Gibbons

The word planet comes from a Greek word that means

• orbiter

• goddess

• wanderer

• light bearer

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Why are people able to see a planet?

• The sun shines on it.

• It is made up of gases that give off light.

• The heat in its core makes it glow.

• It is radioactive.

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How can yo ut ell when you are looking at a planet in the night sky?

• It seems to move quickly across the sky.

• It appears to be a steady point of light.

• It twinkles more than stars do.

• It changes color from hour to hour.

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The nights on Mercury are bitter cold because the planet

• rotates very quickly

• has a high level of hydrogen

• has no atmosphere

• does not have a magnetic field

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Besides the sun and the moon, the brightest object in our sky is

• Venus

• Jupiter

• Orion

• the Big Dipper

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How are Venus and the planet Earth alike?

• Their days are both about 24 hours long.

• The rotate at the same speed.

• They are almost the same size.

• Their temperatures are the same.

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According to astronomers, why does Mars look red?

• Iron on its surface has been rusted by its thin atmosphere.

• Particles in the atmosphere refract only red light.

• It is constantly in Earth's shadow.

• The reflection of the sun causes an optical illusion.

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What is true of Saturn?

• Its rings are made of molten metals.

• It has no moons.

• It is the second smallest planet.

• It is extremely cold.

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What causes Neptune to look blue?

• a gas in its atmosphere

• a reflection cast by Uranus

• one large ocean that covers most of the planet's surface

• water vapor trapped in its stratosphere

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What does Pluto sometimes do?

• It slows down as it rotates on its axis.

• It changes color from orange to purple.

• It glows more brightly than Uranus.

• It orbits closer to the sun than Neptune.

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