Answer:
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
What two letters in the alphabet say goodbye?
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
Come up and we go, Go down and we stay.
Goliath, The Jolly Green and Andre are all examples of this.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?