Without the Sun, Earth would be a cold, dark planet.

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Galileo did not invent the telescope.

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Astronomy, or the study of space, began with a telescope.

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Satellites circle the globe and take photographs of Earth, the Moon, stars ,and other planets.

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Alan Shepard became America's first astronaut in 1961.

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Astronauts took pictures of the moon and Earth from space.

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Astronauts wanted to answer important questions.

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The Hubble Space Telescope helps scientists study Earth and its neighbors.

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The Hubble Telescope also helps astronomers see planets outside of our solar system.

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Scientists have learned many things about the solar system from satellites.

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