Early astronomers, like _________ and Ptolemy believed that Earth was the center of the universe and all other heavenly bodies orbited around Earth.

_________ helped prove that the sun is the center of our solar system by using a telescope that he invented.

Mercury, Venus, Earth, and Mars are considered __________ planets.

Terrestrial means _______

Jupiter, Saturn, Uranus, and Neptune are called _____giants

_______ is closest to the sun and is a small, heavily cratered planet.

Mercury looks like our moon. Mercury is the _________ planet in our solar system and its atmosphere is very thin.

Venus is the second planet from the sun. Similar to _____ in size and mass

Venus has a permanent blanket of clouds that traps _______ energy which causes high surface temperatures

Earth is the _____ planet from the sun a. second

Earth’s atmosphere, its liquid water, and its distance from the sun (among other factors) make Earth ideal for ____

Mars is the fourth planet from the sun and is sometimes called the ___ ______

Jupiter is the fifth planet from the sun, the _______ planet in the solar system

Jupiter is ______ times larger than Earth

Jupiter has no solid surface. Its colored cloud patterns are caused by enormous ______ in its atmosphere

Saturn is the _____ planet from the sun

Early scientists thought Saturn was the only planet with _____, but we now know that all four gas giants (Jupiter, Saturn, Uranus, and Neptune) have them

Uranus is a gas giant and is unique in that it _____ on its side

Uranus is the _______ planet from the sun

Neptune appears ____ because of its atmosphere. It is roughly four times the size of Earth

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