Earth moves in two different ways. What are they?
Rotation and revolution
How long does it take Earth to make one rotation?
24 hours
What does Earth’s rotation cause?
Day and night
How long does it take Earth to complete one revolution around the Sun?
365 days and six hours
What does Earth’s revolution cause?
The different seasons
The extra six hours every year create what special year?
A leap year
In the geocentric model, what is at the center of the universe?
Earth
Which Greek philosopher believed the Earth was the center of the universe?
Aristotle
Who developed the heliocentric model?
Nicolaus Copernicus
Who used a telescope to study the planets and support Copernicus’ idea?
Galileo Galilei
Who said planets move in elliptical orbits?
Johannes Kepler
What does the word “geo” mean in Latin?
Earth
What shape did Ptolemy use to describe planets and stars?
Spheres
How does the tilt of the Earth affect the planet?
It causes the seasons
What are artificial satellites?
Human-made objects that orbit Earth or other planets.
What are satellites used for?
Communications, photography, surveying, and navigation.
