Answer:
Digital white-out.
I am a mother from a family of eight. Spins around all day despite my weight. Had a ninth sibling before founding out it's fake.
What do you get when you cross a cow with a trampoline?
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. What am I?
Things here are usually tagged with red stickers.
Brings the sky a lot closer.