What AU Means
- AU = Astronomical Unit
It means the distance from Earth to the Sun.
The Distance
- 1 AU = about 93 million miles
- 1 AU = about 150 million kilometers
This is the average distance between Earth and the Sun.
Why Scientists Use AU
Space is very big.
Instead of writing huge numbers, scientists say AU.
Example:
- Earth → 1 AU from the Sun
That is easier than writing 93,000,000 miles.
Simple Planet Distances (AU)
| Planet | Distance from Sun |
|---|---|
| Mercury | about 0.4 AU |
| Venus | about 0.7 AU |
| Earth | 1 AU |
| Mars | about 1.5 AU |
| Jupiter | about 5 AU |
Esoplanet 