The Outer Planets: the Moving Planets

The video explains the historical misconception that the sun orbited the earth and how astronomers proved that planets, including Earth, orbit the sun in elliptical paths. It describes the concept of revolution, the time it takes for a planet to orbit the sun, and rotation, the spinning of planets on their axes. Earth takes about 365 days for a revolution and 24 hours for a rotation, which causes day and night. The video also mentions the varying revolution periods of other planets, like Pluto, which takes 248 years.

What was the historical belief about the sun's movement?

• The sun traveled around the earth.

• The sun orbited the moon.

• The sun was stationary.

• The sun moved in a straight line.

What shape do planets follow in their orbit around the sun?

• Rectangular

• Elliptical

• Triangular

• Circular

How long does it take Earth to complete one revolution around the sun?

• 248 years

• 365 days

• 30 days

• 24 hours

Which planet takes about 248 years to orbit the sun?

• Jupiter

• Venus

• Mars

• Pluto

What is the duration of Earth's rotation on its axis?

• 12 hours

• 24 hours

• 48 hours

• 72 hours