aSTRONOMY

PTOLEMAIC

THE PTOLEMAIC MODEL

• First introduced by Claudius Ptolemy (AD 90- 168)
• Ptolemy had the idea that the sun, star and the moon revolved around the Earth
• This model stayed in place for hundreds of years

COPERNICAN

THE COPERNICAN MODEL

• First ntroduce by Nicolaus Copernicus (1473-1543)
• Copernicus introduce the idea that the Earth revolved around the sun
• The model wasn't perfectly correct but it was a new step in astronomy

ASTRONOMY

Eratosthenes

WHAT DID HE DO ?

• Eratosthenes the sun to measure the size of the round Earth
• He measured the Earth to be 24,660 mile in circumference for his final number

WHAT DID HE DO ?

• Kepler determined that planets traveled around the sun in ellipses
• Kepler also calculated three laws involving the motions of planets we still use today

Galileo

WHAT DID HE DO ?

• Galileo discovered the four primary moons of Jupiter, and rings of Saturn
• He also accredited for creating/inventing the telescope

EINSTEIN

WHAT DID HE DO ?

• Einstein suggested that the laws of physics are the same throughout the universe
• Einstein also stated space and time are linked in an entity known as space-time

KEPLER

HAWKING

WHAT DID HE DO ?

• Hawking suggested that the universe has no boundary or border
• Hawking proposed that, as the universe has a beginning, it will also likely end

MOTION