Astronomy Chapter 1

Which of the following correctly lists our "cosmic address" from small to large?

• Earth, Solar System, Milky Way Galaxy, Local Group, Local Supercluster, universe

• Earth, Solar System, Local Group, Local Supercluster, Milky Way Galaxy, universe

• Earth, Milky Way Galaxy, solar system, Local Group, Local Supercluster, universe

True or false: The observable universe is the same size today as it was a few billion years ago.

• True

• False

An astronomical unit is:

• Any planet's average distance from the Sun.

• Earth's average distance from the Sun.

• Any large astronomical distance.

The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:

• The universe is expanding

• Galaxies repel each other like magnets

• Our galaxy lies near the center of the universe

The light year is a measure of:

• Time

• Distance

• Area

The Milky Way galaxy is in a cluster of galaxies called the _________.

The sun is powered by nuclear _________:

• Fusion

• Fission

• Electricity

The Voyager spacecraft, travelling at 50,000 km/hour would take ______ years to get to the closest star, Alpha Centauri.

• 100

• 1,000

• 10,000

• 100,000

The Milky Way galaxy is __________ light years across.

If you counted one star per second, it would take _______ years to count all the stars in the Milky Way galaxy.

• 3

• 30

• 300

• 3,000