Biblical uses of the word heaven have three different meanings: the sky, space, and God‘s home.
The use of heaven to refer to God’s home is the most commonly understood usage. One example is in Acts 3:21 where it says Jesus must remain in heaven for a time. Another example is that followers of Jesus will be with him in heaven (Ephesians 2:6). Heaven is a popular concept, however, to accept the existence of heaven, one must also acknowledge the possibility of hell, which is not as readily embraced.
Heaven, meaning sky is found in Genesis 8:2: “the floodgates of the heavens had been closed, and the rain had stopped falling from the sky.”
An example of heaven, meaning space, can be found Genesis 15:5, where it says, “look now towards the heavens and count the stars.”