What is the sun?
5 billion years ago this star in our solar system was formed.
What is the only star in our solar system, the sun?
5 billion years are left for star before it dies. Hint: This star is in our solar system.
Who is Ptolemy?
Pronounced as tolemy. He was an ancient Greek philosopher who formed the Geocentric Theory.
What is the Geocentric Theory?
This theory is that the Earth is the center of the universe and and all the planets moved around the Earth.
Who is Nicolas Copernicus?
A man in poland in 1530 who created the Heliocentric theory.
What is the Heliocentric Theory about?
This theory is about the sun being the center of the universe and that all planets moved in perfect circles around it.
Who is Johannes Kepler?
This german mathematican supported Copernicus' theory with one minor change, the planets did not orbit around the sun in a perfect circles but in ellipses (ovals).
What is the first law of motion?
This was one of Newtons laws of motion. Hint: Inertia
What is a revolution?
The movement of a celestial object around another.
What is a rotation?
When a planet moves around its axis once. It does one________.