8th Grade Unit #7 The Universe /Pre-Test

 Scientists use the light-year to describe the relationships between objects in space. What does a 

    light-year measure?

1. The distance light can travel in one year

2. The number of years it takes light to travel to Earth

3. The brightness of light that travels through space

4. The time it takes light to travel 1 million km

• 1. The distance light can travel in one year

• 1. The number of years it takes light to travel to Earth

• 1. The brightness of light that travels through space

• 1. The time it takes light to travel 1 million km

In your own words, describe what "to scale" means.

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NGSS.HS-ESS2-1

What type of galaxy has no special shape or form?

• 1. a spiral galaxy

• 1. an irregular galaxy

• 1. an elliptical galaxy

• a round galaxy

What type of galaxy is depicted in this image?

• 2. spiral

• 2. irregular

• 2. elliptical

• egg shape

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Which of the following answers ranks the objects in the correct order from smallest to largest?

• 1. Galaxy, solar system, universe

• 1. Universe, solar system, galaxy

• 1. Solar system, universe, galaxy

• 1. Solar system, galaxy, universe

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NGSS.MS-ESS1-3

The color of a star depends on its:

• 1. shape

• 1. brightness

• 1. size

• 1. temperature

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NGSS.HS-PS4-3

About 90 percent of the stars in the universe, including the Sun, are main sequence stars. What do all

       main sequence stars have in common?

• 1. They are all either smaller than white dwarfs or larger than giant stars.

• 1. All main sequence stars are yellow like our Sun.

• 1. They are undergoing fusion of hydrogen into helium within their cores.

• 1. All main sequence stars are brighter than our Sun.

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NGSS.HS-ESS1-1

On an HR diagram, stars at the same temperature are found...

• • 
    aligned vertically (one above the other)

• • spread through the diagram

• • aligned horizontally (next to each other)

• • along the main sequence

What color are the hottest stars?

• 1. Red

• 1. Orange

• 1. Yellow

• 1. Blue

The H-R diagram is a graph that shows the relationship between __________  and  __________  for stars. 

• 1. brightness and color

• 1. distance and brightness

• 1. temperature and color

• 1. temperature and brightness