Where is Jesus' body now?

In Acts 1 we're told: >After he said this, he was taken up before their very eyes, and a cloud hid him from their sight. They were looking intently up into the sky as he was going, when suddenly two men dressed in white stood beside them. “Men of Galilee,” they said, “why do you stand here looking into the sky? This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven.” **Acts 1:9-11 (NIV)** It is not clear to me what the angels mean by Jesus being taken "into heaven". Some Christians believe that Jesus must still have his physcal body, and therefore is present somewhere in our universe. Others interpret "heaven" to mean the spiritual realm, and therefore Jesus in some way transitioned out of our physical realm, although that leaves the question of what happened to his body. How does Reformed Theology understand where Jesus went when he ascended, and what is their explanation for where Jesus' physical body is now?