Universe

Analyze the image of the model of the Milky Way galaxy.

At which location would you expect to find the sun?

• 1

• 2

• 3

• 4

The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best describes why people on Earth cannot see the entire shape of the Milky Way galaxy?

• Earth is a part of this galaxy.

• Many more stars exist outside the galaxy.

• The stars in the center of the galaxy are extremely small.

• The center of the galaxy consists of a dense cluster of stars.

Which will the sun become when it runs out of fuel?

• A black hole

• A neutron star

• A white dwarf

• All of the above

At what point does a star form from a nebula?

• When gravity pulls the gas and dust of the nebula together

• When the density of the nebula increases

• When nuclear fusion begins

• When fuel runs out in the core

Click on the image: The star Procyon B has a surface temperature of 7,500°C and a low absolute brightness. What type of star is Procyon B?

• Blue supergiant

• Main Sequence

• Red Giant

• White dwarf

What two characteristics of stars are shown in an H-R diagram?

• Absolute brightness and apparent brightness

• Size and surface temperature

• Size and apparent brightness

• Surface temperature and absolute brightness

What is a light-year?

• The distance between two stars

• The distance light travels in one year

• The time it takes light to travel 300,000,000 meters

• The time it takes light to travel to Earth from the Sun

The Milky Way galaxy is an example of a(n)

• spiral galaxy

• globular cluster

• elliptical galaxy

• irregular galaxy

What color are the coolest stars?

• blue-white

• yellow

• red

• orange

Which star is considered a Main Sequence Star?

• A

• C

• B

• D