Answer:
I go up and down at the same time. Up towards to sky and down towards the ground
Sometimes dark and sometimes bright I make my way among twinkling lights. Seas and oceans obey my call yet mountains I cannot move at all. My face is marred and gray But I'm majestic anyway
I help boats park
What gets broken without being held?
I have a name that's not mine and no one cares about me in their prime. People cry at my sight and lie by me all day and night.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.