Question

Sometimes I come in
halves, quarters, or crescents. I am
surrounded by dark, but my shining
light leaves its mark...
What am I?

Answer 1

Answer:

The moon

Explanation:

The moons comes in halves, quarters, and crescents.

Is in the night sky but is usually the brightest thing in the sky, leaving its mark.

Answer 2

Explanation:

I believe it's the moon. I believe this because every couple of days it waxes and wanes to where its full, in halves, quarters, etc. It can clearly be seen during night time, so its surrounded by dark. The sun reflects its light onto the moon, so it looks like its emitting its own shining light.