Unit 2 Lesson 2 Review

Define the term star.

• A large celestial body that is made up of gas and gives off light.

• A large celestial body that is made up of light and gives off gass.

• A large celestial body that is made up of different liquids and gives off light.

• A large celestial body that is made up of gas and gives off different gases.

Define the term luminosity.

• Refers to the actual (absolute) brightness of a star

• Refers to the apparent brightness of a star

• Refers to the color of a star

• Refers to the surface temperature of a star

Define the term apparent magnitude.

• Is the measure of a star brightness as seen from Earth.

• Is the measure of a star brightness as seen from a standard distance.

• Is the measure of a star brightness as seen from the Sun.

• Is the measure of a star brightness as seen from the Milky Way.

What is NOT a physical property of stars?

• The rate of nuclear fusion in the core (Fusing two hydrogen to make helium.)

• Color of the Star

• Size of the Star

• Surface Temperature of the Star

Why is the absolute magnitude of some stars greater than their apparent magnitudes.

• Bright stars that are located far from Earth will have smaller apparent magnitudes but greater absolute magnitudes.

• Dim stars that are located far from Earth will have smaller apparent magnitudes but greater absolute magnitudes.

• Dim stars that are located closer Earth will have smaller apparent magnitudes but greater absolute magnitudes.

• Bright stars that are located close to Earth will have smaller apparent magnitudes but greater absolute magnitudes.

How does the size of the Sun compare to the sizes of other stars.

• The sun is an average size star compared to other stars.

• The sun is a supergiant star compared to other stars.

• The sun is an dwarf star compared to other stars.

What do astronomers call a system that is composed of more than two stars?

• A multiple star system

• A bi-star system

• A 2-star system

• A Tatooine star system.

Which stars have the highest surface temperatures, red or blue stars?

• Red

• Blue

The sun has a surface temperature of 5,527 C. What is the color of the Sun?

• Red

• Orange

• Yellow

• White

A star has a size of 0.1 solar radius. How many times larger is the Sun than this star?

• 1

• 10

• 100

• 1000