Biblical basis for Heaven *not* being a physical place? In Rev. 12 Satan is cast "down" out of heaven.
When the Lord blesses the bread which feeds 5000, He looks "up" into
heaven.
When Stephen is stoned, he also looks "up". 
After resurrection, Jesus is physically lifted up into the clouds.




Yet, despite all these references, I don't think heaven can be a physical place (e.g. outerspace, or somewhere near Jupiter).

What is the biblical basis for heaven not being a physical place?
Jn 18:36 Jesus said, "My kingdom is not of this world . . . this realm"

Heb 9:11,24 Heaven is not of this creation

1 Cor 15:50­51,44 Flesh and blood cannot inherit the kingdom of God.