The sky is the limit.

1.


Planet

The sky is not completely dark at night. Were the sky absolutely dark, one would not be able to see the silhouette of an object against the sky.

2.


Moon

The sky is not completely dark at night. Were the sky absolutely dark, one would not be able to see the silhouette of an object against the sky.

3.


Star

The sky is not completely dark at night. Were the sky absolutely dark, one would not be able to see the silhouette of an object against the sky.

4.


Galaxy

The sky is not completely dark at night. Were the sky absolutely dark, one would not be able to see the silhouette of an object against the sky.