ASTRONOMERS

ARISTOTLE

ARISTOTE

• He thought the universize was infinite
• He argued that the earth was round
• He also thought that the earth was the center of the universe

ARISTARCHUS

ARISTARCHUS

• He claimed that earth orbited the sun
• Also that it rotated on axis
• He thought of the heliocentric model

PTOLEMY

PTOLEMY

• He figured out that planets moved on a epicycle
• He thought that the stars moved on a celestial sphere

NICOLAUS COPERNICUS

COPERNICUS

• He championed the heliocentric model of the solar system
• First to publish a book about the sun as the middle of the model

JOHANENES KEPLER

Untitled Slide

• Figured out ellipses
• Also creates the three laws of planetary motion

KEPLERS FIRST LAW

• All planets orbit the sun
• Planets orbit on ellipses
• The sun is at one of the foci

Kepler's second law
The aphelion and the
perihelion both take the same amount of time to pass

Kepler's third law
Each planet orbits
the sun at diffrent speed so each year on Neptune is longer than Earth's years.

GALILEO

GALILEO

• Discovered the phases of Venus
• Discovered the four moons of Jupitor
• Saw the moon as a miniature planet filled with craters
• Improved upon the telescope

ISAAC NEWTON

ISAAC NEWTON

• Created the three laws of motions
• Created the law of gravity

EDWIN HUBBLE

HUBBLE

• He showed that we were on of many galaxy's
• He explained how the universe was expanding

THANK YOU