What does 'light year' really mean
Solar System 101
National Geographic
100

How long does a light year take to travel

One year

100

What is the end of the solar system called?

Oort Cloud

200

What does one light year equal?

 5.88 billion miles  

5.88 trillion miles

5.88 TRILLION miles

200

What orbits the planets?

Asteroid belt

300

How many light-years across is the Milky Way?

100,000 light years

300

Where in the Milky Way is our solar system?

Orion Spur Star cluster

400

How many seconds does light take to travel from the Moon to the Earth?

1 second

400

What are the four terrestrial planets?

Mercury, Venus, Earth, and Mars

500

A star is 100 light-years away. How long has the star been without light today? 

100 years ago

500

What are the four Jovian Planets?

Jupiter, Saturn, Uranus, and Neptune

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