Unit 7 Review

There are four groups of stars on the HR Diagram. About 90% of all stars are in the ________.

• Supergiants

• Giants

• White dwarfs

• Main sequence

How can you rearrange the words to match the diagram correctly in terms of sizes in space?

• Solar systems in the largest circle, then galaxies, followed by the universe in the smallest circle.

• Universe in the largest circle, then galaxies, followed by the solar systems in the smallest circle.

• Galaxies in the largest circle, then universe, followed by the solar systems in the smallest circle.

• The diagram is already correct.

Analyze this HR Diagram. Which group of stars is considered to have a lower than average luminosity as well as a higher than average temperature?

• Giants

• Main Sequence

• White Dwarfs

• Supergiants

A collection of dust and gas where stars can form is called a...

• universe

• nebula

• black hole

• supernova

Our sun is located near the edge of a ______ galaxy, named the _______.

• Spiral shaped; Milky Way

• Spiral shaped; Solar System

• Elliptical shaped; Milky Way

• Elliptical shaped; Solar System

Stars are classified on the HR Diagram by...

• luminosity and brightness.

• temperature and absolute magnitude (or luminosity).

• temperature and apparent magnitude.

• temperature and distance.

Stars radiate thermal energy through space by a process called _____ where the element _____ is converted into helium.

• nuclear fusion; hydrogen

• nuclear fusion; lithium

• nuclear transfer; hydrogen

• nuclear transfer; boron

Which of the following best describes the sun's position in the Milky Way galaxy?

• The sun is a giant yellow star located close to the galactic core.

• The sun is a medium yellow star located approximately 2/3 of the way down one of the galaxy's spiral arms.

• The sun is a dwarf star located at the end of one of the spiral arms.

• The sun is a medium yellow star located one light year from the galactic core.

A celestial body where the fusion of Hydrogen into Helium creates radiation.

• Planet

• Nebula

• Star

• Comet

A celestial structure characterized by having long, spiral arms and a bright center bulge.

• Elliptical Galaxy

• Spiral Galaxy

• Irregular Galaxy

• Nebula