Astronomy Part 1

What does helios and centric mean?

• Geo means sun and centric means centered, which together mean sun centered.

• Helios means sun and centric means centered, which together mean sun centered.

What does geo and centric mean?

• Geo means Earth and centric means centered which together mean Earth centered.

• Helios means Earth and centric means centered which together mean Sun centered.

What is the main difference between the heliocentric theory and geocentric theory of the solar system?

• The heliocentric theory has the Sun as the center of the solar system, and the geocentric theory has the Earth as the center of the solar system.

• The heliocentric theory has the Earth as the center of the solar system, and the geocentric theory has the Sun as the center of the solar system.

• The heliocentric theory has Earth moving around the Moon, and the geocentric theory has the Sun moving around the Moon.

• The heliocentric theory has the Sun moving around the Earth, and the geocentric theory has Earth moving around the Sun.

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Ptolemy's view of the universe

• Galaxy
• Geocentric
• Astonomy
• Heliocentric

Copernicus' view of the universe

• Galaxy
• Geocentric
• Astonomy
• Heliocentric

Which of the following best explains how Ptolemy’s and Copernicus’s models of the solar system differed?

• Ptolemy’s views of the solar system were rejected, but Copernicus’ views were widely accepted.

• Ptolemy did not have an explanation for why planets would seem to move backwards, but Copernicus did.

• Ptolemy believed in the geocentric solar system, while Copernicus believed in the heliocentric solar system.

• Ptolemy believed everything revolved around the Sun, while Copernicus believed everything revolved around the Earth.

What does the Geocentric system look like?

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What does the Heliocentric system look like?

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The diagram shows two models. Which statement accurately describes both models?

• Model X is the heliocentric model in which Earth is the center of the solar system; model Y is the geocentric model in which the Sun is the center of the solar system.

• Model X is the geocentric model in which the Sun is the center of the solar system; model Y is the heliocentric model in which Earth is the center of the solar system.

• Model X is the heliocentric model in which the Sun is the center of the solar system; model Y is the geocentric model in which Earth is the center of the solar system.

• Model X is the geocentric model in which Earth is the center of the solar system; model Y is the heliocentric model in which the Sun is the center of the solar system.

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NGSS.MS-ESS1-2

Galileo: I support the heliocentric model of Copernicus. With the new invention of the telescope I have made two discoveries: The first one that I made is that there are four moons revolving around Jupiter. The second one is that Venus goes through phases similar to Earth’s moon. The phases of Venus could not be explained if Earth were at the center of the systems of planets. So I state that Ptolemy’s geocentric system could not be correct.

What evidence supported the Heliocentric model?

• The planets revolve around the sun because of similar planetary motion to Venus to Earth.

• The planets must move in elliptical orbits due to gravity and the orbits of all the moons in the universe.

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