Four Days of the Week

What comes once in a minute, twice in a moment, but never in a thousand.

What am I?

What five-letter word becomes shorter if you add two letters to it?

I am in the kitchen. I have lots of food inside me.

I keep food cold.

What I am?

I live in the house. I eat everything.

I am small and grey. Cats eats me.

Who I am?

I am the sixth planet from the sun.

I have 82 moons. My nick name is "The Ringed Planet".

Who am I?