Kepler's Laws and the History of Astronomy

Who developed the three planetary laws of motion?

• Galileo Galilei

• Johannes Kepler

• Isaac Newton

• Tycho Brahe

What was the view of the universe before Copernicus?

• Elliptocentric

• Galactocentric

• Heliocentric

• Geocentric

What shape did Kepler determine the planets' orbits to be?

• Circular

• Elliptical

• Parabolic

• Hyperbolic

What did Tycho Brahe contribute to astronomy?

• Developed the telescope

• Made precise measurements of the cosmos

• Discovered gravity

• Proposed the heliocentric model

What is Kepler's Second Law?

• Planets emit light when they are closest to the Sun

• Planets move faster when closer to the Sun

• The square of the orbital period is proportional to the cube of the semi-major axis

• The orbit of a planet is an ellipse

What does Kepler's Third Law state?

• The square of the orbital period is proportional to the cube of the semi-major axis

• The force of gravity is inversely proportional to the square of the distance

• Planets move in a circular orbit

• The Sun moves around the Earth

Who confirmed the heliocentric model using a telescope?

• Isaac Newton

• Galileo Galilei

• Johannes Kepler

• Tycho Brahe

What did Ptolemy add to Aristotle's geocentric model?

• Moons

• Epicycles

• Ellipses

• Comets

What is the shape of the orbits according to the heliocentric model before Kepler?

• Spiral

• Rectangular

• Circular

• Elliptical

What did Isaac Newton explain that Kepler could not?

• The discovery of America

• The invention of the telescope

• The reason behind the laws of planetary motion

• The shape of the orbits