WONDER #1592: How Big Is the Solar System?

Question 1 of 3

The average distance from Earth to the Sun is the basis of which astronomical measurement?

1. astronomical unit
2. light year
3. light day
4. light second

Question 2 of 3

One astronomical unit (AU) is equal to approximately how many miles?

1. 93
2. 9.3 million
3. 93 million
4. 930 million

Question 3 of 3

What do astronomers call the theoretical area at the edge of the solar system that could be the origin of the icy comets that move into the inner solar system from time to time?

1. Proxima Centauri
2. heliopause
3. Neptune
4. Oort Cloud

Check your answers online at https://wonderopolis.org/index.php/wonder/how-big-is-the-solar-system.