Parallax is used to determine a star’s

• distance from Earth.
• temperature.
• composition.
• brightness.

Characteristics used to classify stars include

• distance, size, and color.
• size, distance, and brightness.
• color, brightness, and distance.
• size, brightness, and temperature.

What color are the coolest stars?

• blue-white
• yellow
• red
• orange

The absolute brightness of a star depends on its

• distance and temperature.
• size and temperature.
• color and temperature.
• distance and color.

The Hertzsprung-Russell diagram shows that main-sequence stars

• are mostly hot and dim.
• are mostly cool and bright.
• increase in brightness as they increase in temperature.
• decrease in brightness as they increase in temperature.

Astronomers typically measure distances to stars in units called

• kilometers.
• light-years.
• parallax.
• electromagnetic spectrum.

The brightness of a star as seen from Earth is its 

• apparent brightness.
• absolute brightness.
• parallax.
• reflective brightness.

Gravity plays an important role in forming _____________, stars, and planets.

• solar systems
• meteroids
• asteroids
• galaxies

The brightness the star would have if it were a standard distance from earth.

• Apparent Brightness
• Absolute Brightness
• Brightness
• Candid Brightness

What color of star is the hottest?

• Blue
• Red
• Yellow
• Orange