The Heavens

There are three heavens:

1. Sky
2. Outer space
3. God's home (angels, etc)

In Hebrew there's only one word for all of these. In order to understand which one is referred to, we must examine the context.

For example...

Heaven + fowl = Sky

And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven.
- Genesis 1:20 (KJV)

Heaven + sun/moon/stars = Outer space

And lest thou lift up thine eyes unto heaven, and when thou seest the sun, and the moon, and the stars, even all the host of heaven, shouldest be driven to worship them, and serve them, which the Lord thy God hath divided unto all nations under the whole heaven.
- Deuteronomy 4:19 (KJV)

Heaven + throne = God's home

Now of the things which we have spoken this is the sum: We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens;
- Hebrews 8:1 (KJV)

When studying the Bible, it is always a good idea to look at the context.