I'm light, I'm dark; yet I'm not always around. Sometimes I'm half, sometimes I'm full. What am I?

Question

I am full of light but left in the dark. I have a temper that pushes my single sibling. I have many friends very far away and I disappear in the light when it is my sibling's turn to push me back. What am I?

Answer 1

RESULT: I'm the moon.

Answer 2

'The MOON' it has no light means it is dark
But it flows so it is also light
At the time of lunar eclipse it is not there
It is half when our earth revolve
It is also full on a full moon day