Section 1 Vocab. (p950) Flashcards
Vocabulary
Geocentric model
Earth is considered the center and everything else revolves around it.
Heliocentric model
The Moon revolves around the Earth and that Earth and the other planets revolve around the Sun.
Extrasolar planets
The planets in orbit around stars other than the Sun.
What are the models of the Solar system?
- The geocentric model was developed by the Greek philosopher Ptolemy.
- Earth is considered the center and everything else revolves around it.
- The Heliocentric model was developed by Polish astronomer Nicholas Copernicus.
- Sun-centered model of the solar system. The apparent motion of the planets is due to the Earth’s rotation.
- The Italian astronomer Galileo Galileo supported Copernicus’s model.
What astronomer discovered the planets travel around the Sun in ellipsis?
-German astronomer Johannes Kepler discovered the planets travel around the Sun in ellipsis, or not a perfect sphere.
True or False: Do planets travel at different speeds?
Yes, Planets travel a different speeds in their orbits.
How far is an astronomical unit (AU)?
The average distance from Earth to the Sun, about 150 million km.
What are the planets similar to Earth?
Terrestrial planets, are planets are similar to Earth.
What are the Terrestrial planets?
Mars, Mercury, and Venus.
What are the giant/gas planets also known as?
The Jovian planets.
What are the four Jovian planets?
Neptune, Uranus, Saturn, and Jupiter.
What are the two names of the planets that are within the asteroid belt and beyond the asteroid belt?
Inner planets and Outer planets.
Which planets are considered the Inner planets?
Mercury, Venus, Earth, and Mars.
Which planets are considered the Outer planets?
Jupiter, Saturn, Uranus, and Neptune.
What are are the planets that are between the Sun and Earth’s orbit and the planets beyond Earth’s orbit?
- Between the Sun and Earth’s orbit the planets are call Inferior.
- The planets beyond the Earth’s obit ate Superior.
