Astronomy Review

Model of the solar system with the sun at the center.

• Heliocentric

• Geocentric

• Erythrocentric

• Lunarcentric

Model of the solar system with the earth at the center.

• Geocentric

• Heliocentric

• Mesacentric

• Lunarcentric

Astronomer who proposed the popular geocentric model, which was accepted for more than 1000 years.

• Ptolemy

• Copernicus

• Kepler

• Galileo

Astronomer who proposed a heliocentric model of the solar system, which was not accepted at first.

• Ptolemy

• Copernicus

• Kepler

• Galileo

Astronomer who used math to show that planets orbit stars in ellipses, not perfect circles. Supported heliocentric model.

• Ptolemy

• Copernicus

• Kepler

• Galileo

Astronomer who first used a telescope to observe the heavens. Saw Jupiter's moons and the phases of Venus, which supported heliocentric model.

• Ptolemy

• Copernicus

• Kepler

• Galileo

The closest planet to the sun. Orbits the sun very quickly.

• Mercury

• Venus

• Earth

• Mars

The 2nd planet from the sun. Has a thick atmosphere that makes it the hottest planet.

• Mercury

• Venus

• Earth

• Mars

The 3rd planet from the sun. Some people live here. Most of us were born here.

• Mercury

• Venus

• Earth

• Mars

The 4th planet from the sun. It's red and a lot like Earth.

• Mercury

• Venus

• Earth

• Mars