lecture 5

Question 1

The geocentric universe

Answer 1

• All planets orbit the earth
• Earth was the center

Question 2

Copernicus

Answer 2

• The sun is the center of the universe
• Planets orbit the the sun in circles
• The moon orbits the earth

Question 3

Tycho brahe

Answer 3

• Made accurate measurements
• Observed a super nova

Question 4

Kepler’s first law

Answer 4

• The orbit of each planet is an ellipse with the sun at the focus
• When the eccentricity is 0, it’s a circle
• When the value of an eccentricity is bigger, its more elliptical

Question 5

Kepler’s second law

Answer 5

A planet moves faster near the sun

Question 6

Kepler’s third law

Answer 6

slower farther away from the sun