18 Intro to Astronomy Summary

What did a month represent in our ancient calendars?

• The time it takes for the Earth to orbit the sun once

• The complete cycle of the moon phases

• The time it takes for the Earth to rotate once on its axis

• The time it takes for the moon to orbit the Earth once

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What did people in ancient cultures mark to note the passage of time?

• The positions of comets and asteroids

• The positions of planets, the moon, and the sun

• The positions of stars and galaxies

• The positions of constellations and meteor showers

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Who proposed the heliocentric theory, which states that the sun is the center of the universe?

• Claudius Ptolemy

• Nicolaus Copernicus

• Galileo Galilei

• Johannes Kepler

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

• Circular

• Triangular

• Elliptical

• Hexagonal

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Which of the following was one of Galileo's discoveries using a telescope?

• Saturn appeared to have ears (rings)

• Jupiter has at least four moons

• The moon has craters and mountains

• All of the above

What did Isaac Newton's laws of gravity explain about the planets' motion?

• The planets move randomly through space

• The planets are stationary and do not orbit

• The planets orbit the sun due to the force of gravity

• The planets orbit the Earth due to magnetic forces

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How did Tycho Brahe's work help astronomers?

• By proving the Earth was the center of the universe

• By providing the most complete and detailed collection of measured astronomical observations

• By inventing the telescope

• By discovering gravity

What does the term 'day' refer to in astronomy?

• The time it takes for the Earth to orbit the sun

• The time it takes for the Moon to orbit the Earth

• The time it takes for the Earth to rotate once on its axis

• The division of the year that is based on the orbit of the moon around the Earth

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What does the objective lens in a telescope do?

• It magnifies the image that forms at the focal point

• It collects light from distant objects

• It reflects light to form an image

• It is used to view the image directly

What is the purpose of the eyepiece lens in a telescope?

• To collect light from distant objects

• To reflect light and form an image

• To magnify the image that forms at the focal point

• To focus the light and form an image at a focal point