And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight. And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel; Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
It really happened, and the visible return of Jesus to heaven is evidence of his coming back to earth again. Jesus said, “In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you” (John 14:2). Heaven is a prepared place for a prepared people. Oh, let me be prepared and ready when Jesus returns to earth again.
1 minute x 365 days = 1 year of working your way through Bible passages from most NT chapters in chronological order and some from the OT.