18-1: Astronomy: The Original Science

Question 1

astronomy

Answer 1

the study of the universe

Question 2

year

Answer 2

the time required for the Earth to orbit once around the Sun

Question 3

month

Answer 3

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

Question 4

day

Answer 4

the time required or the Earth to rotate once on its axis

Question 5

What is Ptolemy’s theory?

Answer 5

(Plotemaic theory)

The Earth was the center of the universe and the other planets including the Sun revolved around the Earth

Question 6

What is Copernicus’ theory?

Answer 6

The Sun is the center of the universe and all of the other planets, including the Earth orbit the Sun

Question 7

What is Tycho Brahe’s theory?

Answer 7

The Sun and the moon revolved around the Earth while the other planets revolved around the Sun

Question 8

What is Johannes Kepler’s theory?

Answer 8

All planets revolve around the Sun in elliptical orbits but the Sun is not in the exact center of the universe

Question 9

What did Galileo do?

Answer 9

He became one of the first people to use a telescope to observe objects in space; he discovered craters and mountains on the Earth’s moon, four of Jupiter’s moons, sunspots on the Sun, and the phases on Venus

Question 10

What is Issac Newton’s theory?

Answer 10

He showed that objects in the universe attract each other through gravitational force; Newton’s law of gravity explained why all of the planets orbit the most massive object in the solar system-the Sun

Question 11

What is Edwin Hubble’s theory?

Answer 11

He proved that other galaxies exist beyond the Milky Way