Answer the following question given this paragraph: 

Uranus is faint because it is very far away. Its distance from the Sun is 2.8 billion kilometers (1.8 billion miles). A photon from the Sun takes about 2 hours and 40 minutes to reach Uranus. Uranus orbits the Sun once about every 84 Earth years.


Q: Why is uranus so faint?

 Choices:

- polluted atmosphere

- too small

- too cold

- far away

A:
far away
