Earth: Our Home Base
What is a planet?
· A planet is an object in space that moves around a star
· It is a sphere (a ball) that is at least 1000 km is diameter
· Planets do not produce their own energy (light and heat) like stars do
· Pluto is no longer considered a planet. It is called a “dwarf planet”.
The Earth: Our Special Planet
· The surface is mostly covered in water
· The atmosphere allows us to breathe and it protects us from the harmful rays of the sun
· It is the only known planet that supports life
Rotation
· Earth rotates on its axis spinning like a top
· It takes 23 hours and 56 minutes to spin completely once around
· If our side of Earth is turned toward the sun, we have day
· When our side is turned away from the sun, we have night
Revolution
· Earth revolves around a star called the Sun
· The Earth and all the other planets in the solar system revolve or orbit around the sun in a “circular” path
· It takes 365.25 days to for the Earth to complete one orbit (revolution) around the sun
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