1. Astronomy foldable

2. Revolution The movement of a planet around the sun
One revolution around the sun equals one year
Planets orbit/revolve around the sun
The further away you are from the SUN the longer it will take to make a complete revolution

3. Rotation The spinning motion of a planet about its axis
One complete rotation equals one day
This causes night and day to occur
You can rotate a basketball on your finger
A ballerina rotates when they pirouette

4. Geocentric Theory
A theory that Earth is the center of the revolving planets
Geo is the Greek word for Earth
This theory was later disproven by Galileo

5. Heliocentric Theory Earth and the other planets revolve around the Sun
Helios is the Greek word for Sun
Discovered by Copernicus in the 1500’s
Proven to be true by Galileo

6. Inertia
A moving object will continue to move in a straight line and a stationary object will continue to remain in place
The more mass an object has the more inertia it has
The larger it is the harder it is to start or stop movement

7. Gravity The force that pulls objects towards each other
The strength of gravity depends on the mass of the objects and the distance between them
Gravity is what keeps us from floating around in the air

8. Inertia Gravity Inertia and Gravity
Newton figured out that Earth keeps pulling the moon towards it with gravity but the moon keeps moving because of inertia
Inertia causes the planets to move in space and the sun’s gravity pulls them towards the sun causes them to move in a orbital pattern
Inertia
Gravity

9. Galileo Galileo was a scientist and astronomer
He used a telescope to discover Jupiter had 4 moons revolving around it
The 4 moons he discovered are Lo, Europa, Ganymede and Callisto.
He also discovered that Venus goes through phases like the moon

10. Galileo
His observations help prove the heliocentric system which states that the earth and the other planets revolve around the sun
Galileo was tried for heresy because his beliefs went against the church