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A light year is the 

• distance that light travels in one year

• Speed at which light travels 

• Distance between the sun and the earth. 

• Distance at which light no longer exists. 

What do we use astronomical units to measure?

• distances in our solar system
  

• How far our solar system is from others in our galaxy.
  

• The distances between galaxies. 
  

• The distance from one side of the universe to the other. 

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NGSS.MS-ESS1-3

What is an astronomical unit (A.U.)?

• the time it takes light to travel one year

• the distance between the Earth and the Moon

• the distance between the Earth and the Sun

• the distance between the Earth and the Neptune

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NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

Why do we use light years and astronomical units to measure distances in space?

• Scientists want to sound smart.

• Hubble discovered these units and wanted to use them.

• Space is too small to use km, it wouldn't make sense.

• Space is too big, vast, enormous to use traditional units, like miles.

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NGSS.MS-ESS1-3

Which of the following scenarios would be appropriate to use light years?

• From the sun to Earth

• from Earth to Neptune

• from the Milky Way to its closest galaxy

• Asteroid Belt to the Kuiper Belt

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NGSS.MS-ESS1-3

Which of the following scenarios would we use Light Years to determine, not Astronomical Units (AU)?

• distance from Mercury to Saturn

• distance from Sun to Neptune

• distance from Earth to Sun

• distance from Asteroid Belt to the Betelgeuse Star

Which of the following is CLOSEST to planet Earth:

• Jupiter

• Andromeda Galaxy

• Earth's moon

• the Sun

Space exploration has advanced our knowledge of the universe.

Which space journey would take the longest.

• A journey from Earth to the sun.

• A journey from Earth to the moon.

• A journey from Earth to a star in the constellation Centaurus.

• A journey from Earth to the farthest planet in our solar system.

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NGSS.MS-ESS1-3

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

• the distance that light can travel in one year

• the brightness of light that travels through space

• the number of years it takes light to travel to Earth

• the time it takes light to travel 1 million km

Answer explanation

A light-year measures the distance that light can travel in one year, making it a unit of distance, not time or brightness. This is why the correct answer is 'the distance that light can travel in one year'.

The average distance between the Sun and Earth is called ...

• a red shift

• The Astronomical Unit

• a light-year

• a parsec

Answer explanation

The average distance between the Sun and Earth is known as The Astronomical Unit (AU). It is a standard measurement in astronomy, while red shift, light-year, and parsec refer to different concepts in space measurement.