Chapter 9 Earth Science

What is an Astronomical Unit (AU)?

• The average distance between the Moon and the Sun

• The average distance between Earth and the Sun

• The distance light travels in one year

• The distance between the Earth and the Moon

How many miles is one Astronomical Unit (AU) approximately equal to?

• 93 thousand miles

• 93 million miles

• 150 thousand miles

• 150 million miles

What are Astronomical Units usually used to measure?

• Distances between galaxies

• Distances within our Solar System

• The size of stars

• The depth of oceans on Earth

When was the first man landed on the moon?

• July 4, 1969

• July 20, 1969

• December 25, 1969

• November 11, 1969

Who were the astronauts that landed on the moon on July 20, 1969?

• John Glenn and Alan Shepard

• Neil Armstrong and Michael Collins

• Buzz Aldrin and Michael Collins

• Neil Armstrong and Buzz Aldrin

What have scientists learned a great deal about the Moon from?

• The Hubble Space Telescope observations

• The Apollo missions

• The International Space Station experiments

• The Mars Rover missions

Aside from the Apollo missions, what other sources have contributed to the study of the Moon?

• Observations from Earth-based telescopes

• Data from rovers and satellites sent to the Moon

• Studies of meteorites found on Earth

• Solar wind measurements

What is the diameter of the Moon?

• 3,476 km

• 2,159 km

• 4,217 km

• 5,321 km

How does the Moon's gravity compare to Earth's gravity?

• It is the same as Earth's gravity.

• It is one-fourth as strong as Earth's gravity.

• It is one-sixth as strong as Earth's gravity.

• It is twice as strong as Earth's gravity.

How long does it take for the Moon to make one complete orbit around the Earth?

• 24.7 days

• 27.3 days

• 29.53 days

• 30.1 days