Astronomy Focus Area 1-3

Objective 1

Structure of the Universe

Multiple Choice

According to the modern theory of the universe’s origin, which graph best shows the trend in the volume of the universe over time?

Multiple Choice

According to the modern theory of the universe’s origin, which one explains the trend in the volume of the universe over time?

• More galaxies other than the Milky Way have been discovered.

• Other planets in the solar system have more moons than Earth.

• The average distance between galaxies is increasing.

Objective 2

Galaxies

Multiple Choice

What accounts for most of the visible mass in the universe?

• Moons

• Planets

• Galaxies

• Asteroids

Multiple Choice

The number of stars in the Milky Way Galaxy is best estimated as

• one hundred trillion.

• one hundred billion.

• one hundred thousand.

How do astronomers classify galaxies?

They classify galaxies by shapes!

Multiple Choice

Just as biologists classify living things, astronomers classify galaxies. What feature is used to classify galaxies?

• color

• Brightness

• Shapes

• size

Where are we then?

Our galaxy is called the Milky Way galaxy, and the Earth is located on the outer edge.

Can you guess what type of galaxy it is? (it is in Spiral shape)

Multiple Choice

Earth is located on the outer edge of the disc-shaped __________ galaxy.

• Solar System

• Milky Way

• Dig Dipper

• Orion

How tiny am I?

Humans -> Stars -> Galaxies -> Galaxy clusters -> superclusters

->universe

Multiple Choice

In 2004 the Hubble space telescope captured images of distant star clusters, each containing about a million stars. These star clusters were most likely part of which structure?

• A solar system

• A galaxy

• A black hole

Multiple Choice

Which of the following BEST describes order of the groups, from smallest to largest, that compose the visible mass of the universe?

• stars → galaxies → galaxy clusters → superclusters → universe

• stars → galaxies → galaxy clusters → superclusters → dark matter → universe

• stars → dark matter → galaxies → galaxy clusters → superclusters → universe

Multiple Choice

The average distance between the Earth and the sun is measured in which type of unit?

• astronomical (AU)

• space

• light

Objective 3

Stars

Average stars

The most common elements stars are made of Hydrogen and Helium

A Star is born when it begins nuclear fusion

Our Sun and most stars are in the Main Sequence stage of their life cycle

Our sun is considered to be an average star

Multiple Choice

Which of the following BEST describes the sun, compared with other stars in the universe?

• The sun is very large compared to other stars and is powered by nuclear fusion reactions.

• The sun is very small compared to other stars and is powered by nuclear fusion reactions.

• The sun has an average size compared to other stars and is powered by nuclear fusion reactions

Multiple Choice

A star with less mass will live __________ because it consumes fuel at a slower rate than do more massive stars.

• longer

• shorter

• equally to the a star with more mass

Multiple Choice

A star with less mass will live __________ because it consumes fuel at a slower rate than do more massive stars.

• Longer

• Forever

• the same amount of time

• less