Openstax Astronomy

According to the Big Bang Theory, which of the following is true?

• All matter in the universe began at a central point and then expanded outward.
• All matter in the universe began to shrink to a central point rapidly.
• The universe started with a loud explosion.
• The universe has be a constant shape since the beginning of time.

The formula P2 = a3 is an expression of

• Kepler's 3rd Law
• Newton's 2nd Law
• Kepler's 1st Law
• Kepler's 2nd Law

The name for the average sun-to-earth distance is

• A Year
• A Light Year
• An Astronomical Unit
• A Parsec

What did Galileo NOT see?

• Mountains on the earth's moon.
• Uranus's moons Titania and Oberon.
• Jupiter's 4 largest moons.
• The phases of Venus.

Which astronomer of antiquity measured the size of the earth?

• Aristarchus
• Ptolemy
• Copernicus
• Eratosthenes

Which astronomer of antiquity made elaborate models of an earth-centered universe?

• Copernicus
• Aristarchus
• Ptolemy
• Tycho Brahe

Which astronomer of antiquity first applied a telescope to astronomical observation?

• Ptolemy
• Galileo Galilei
• Tycho Brahe
• Copernicus

Ancient Greeks believed, the earth to be the centr of the universe. What do we call this model?

• Ptolemic System
• Geocentric Universe
• Heliocentric Universe
• Copernican Model

Who first suggested that earth rotated on its axis?

• Tycho Brahe
• Aristarchus
• Aristotle
• Copernicus

Ancient astronomers used 'epicycles' to explain...?

• Retrograde Motion
• Constellation Movement
• Moon's Phases
• Planetary Transits