Main Idea - Earth and Its Neighbors

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

Galileo did not invent the telescope.

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

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

Alan Shepard became America's first astronaut in 1961.

Astronauts took pictures of the moon and Earth from space.

Astronauts wanted to answer important questions.

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

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

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