Solar System Model

The "backward loops" that most planets would appear to do once a year is called

• planetary motion.

• retrograde motion.

• prograde motion.

• a mystery.

Tags

NGSS.MS-PS2-4

Why was the Ptolemaic model of the universe accepted for so long?

• no one had ever thought of a better explanation

• people were prone to superstition

• it basically explained most of the movements of the planets

• religious & cultural reasons liked to put Earth at the center

Tags

NGSS.MS-ESS1-1

Aristarchus (of ancient Greece) correctly predicted the _______ theory of the Universe.

• geocentric

• heliocentric

• earth-centered

• sun-centered

Heliocentric theory has the ____ revolving around the Sun, with only the ____ orbiting Earth.

• Moon, planets

• Moon, Sun

• stars, Moon

• planets, Moon

Tags

NGSS.MS-ESS1-1

How did the heliocentric model of the Universe explain retrograde motion of the planets?

• orbital speeds led to the illusion of retrograde motion

• planetary motion was apparent and not real

• by using epicycles & deferents

• the model did not fully explain retrograde motion

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

What was the main reason why the heliocentric model made more sense than the geocentric model?

• it was simpler

• it fully explained planetary motion

• it explained why the stars were "fixed" in the night sky

• it did not require over 80 "circles within circles"

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Why were planetary motions unpredictable?

• because they were representative of the Greek gods

• planets "wandered" or moved in backward loops unexpectedly

• ancient peoples had very little insight into the heavens

• they did not represent the stars so they were unpredictable

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Whose heliocentric model is seen as the first step in the development of the modern models of the solar system?

• Galileo

• Copernicus

• Ptolemy

• Kepler

A model of the solar system in which Earth and the other planets revolve around the sun.

• Heliocentric

• Geocentric

Tags

NGSS.MS-ESS1-1

A model of the universe in which Earth is at the centre of the revolving planets and stars. This includes the sun revolving around the Earth.

• Heliocentric

• Geocentric