Chapter 3

The H-R diagram shows the relationship of a star's surface temperature and its

• color

• size

• apparent brightness

• absolute brightness

All of the following are major types of galaxies EXCEPT

• spiral galaxy
• irregular galaxy
• elliptical galaxy
• triangular galaxy

Which star has the highest absolute brightness (luminosity)?

• A

• B

• C

• D

Scientists think the Milky Way is

• an irregular galaxy

• an elliptical galaxy

• a spiral galaxy

• a nebula

A star begins as a ball of gas and dust pulled together by

• black holes.
• electrons and protons.
• heavy metals.
• gravity.

The brightness of a star as it appears to an observer on Earth.

• absolute brightness

• light-year

• spectrum

• apparent brightness

A large grouping of stars, dust, and gas bound together by gravity.

• open cluster
• globular cluster
• galaxy
• quasar

Which star is considered a Main Sequence Star?

• A
• B
• C
• D

What process takes place inside a star to generate energy?

• Nuclear joining

• Hydrogen creation

• Nuclear fusion

• Helium forming

The brightness that a star would have at a standard distance from Earth

• spectrum

• parallax

• apparent brightness

• absolute brightness