Galaxies and stars

What is the brightness of a star as it appears to an observer on Earth?

• Absolute magnitude

• Apparent Magnitude

• temperature

• Color

What is the distance that light can travel in one year? 

• Light year
• Irregular Galaxy
• Supernova
• Quasar 

What is a large grouping of stars, dust, and gas bound together by gravity?

• Nebula
• Galaxy
• Cosmology
• Gravity

The Milky Way Galaxy is most likely 

• an irregular galaxy
• a spiral galaxy
• an elliptical galaxy
• a nebula

Which is the hottest?

• a red giant
• small, white dwarf
• main-sequence yellow star
• main-sequence blue star

A student notices that the moon looks larger than the stars.  Why?

• The moon is reflecting light from the sun
• The moon is closer to Earth then the stars
• The moon is much larger than the stars
• The moon is much larger than Earth

The sun appears brighter than other stars because

• it is the largest star in the universe
• it is the hottest star in the universe
• able to radiate more energy than other stars
• is closer to Earth than other stars

Which of the following is not a type of galaxy?

• Irregular
• Triangular
• Spiral
• Elliptical 

The majority of stars (including our Sun) are in their longest phase, which is called...

• white dwarf

• H-R Diagram

• Red giant

• Main-sequence

What are galaxies held together by?

• Gravitational Attraction
• Stars
• Other galaxies
• Dust and Gas