Grades 3-5 (Ages 8-10)


Because it is so far from the Sun, astronomers had a hard time measuring Pluto’s size. They finally got it

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After the discovery of Uranus in 1781, astronomers had a difficult time accurately describing the planet's orbit. Uranus seemed to

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The poles of most planets aim away from the plane of the solar system; like Earth's poles, they point roughly

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Scientists, too, have speculated about the possibility of life on Mars. During the 1800s, some leading astronomers thought that an

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