Planet Motion 30.1 Flashcards
geocentric model
Earth-centric model of the solar system
heliocentric model
sun-centered model of the solar system
extrasolar planet
planets in orbit around another star
Who developed the geocentric model?
Ptolemy
Who developed the heliocentric model?
Nicholas Copernicus
Who used the telescope to support Copernicus’s Model?
Galileo Galilei
Who discovered the planets travel around the Sun in ellipses?
Johannes Kepler
True/False: Planets travel at different speeds in their orbits?
True
astronomical unit
The average distance from Earth to the Sun
What planets are similar to Earth?
terrestrial planets
Which planets are classified as terrestrial planets?
Venus, Mars, Mercury
Gas giants are known as ______ planets?
Jovian
Which are classified as Jovian planets?
Jupiter, Saturn, Uranus, Neptune
What are the planets classified as that are located between the Sun and the asteroid belt?
Inner planets
What are the planets that are located between the Sun and the asteroid belt?
Mercury, Venus, Earth, Mars