On a similar note to the post below this one, I found a video on YouTube by a user named KingHeathen, and he mentioned something that I did know but hadn't played connect-the-dots with.
Mark chapter 16 begins with the account of Mary, Mary and Salome visiting the tomb of Jesus to find the stone already rolled away and Jesus' body missing. There is a "young man sitting on the right side, clothed in a long white garment", who tells them that Jesus is risen. The book of Mark ends with this at verse 8 "And they went out quickly, and fled from the sepulchre; for they trembled and were amazed: neither said they any thing to any man; for they were afraid."
Most decent Bibles will then have a little note that says something like this after verse 8.
"The most reliable early manuscripts and other ancient witnesses do not have Mark 16:9-20."
Mark 16:9-20 is the part that mentions Jesus appearing to many people after the resurrection and ascending into heaven.
As we know, Mark is the earliest gospel of the 4 in the Bible, and these last verses are a later addition. So, the earliest gospel doesn't really mention the resurrection in any detail, all we hear is from a man sitting inside Jesus' tomb explaining that the reason there is no body is because he rose from the dead.
So, who was the man in the white robes? We aren't told, Mark and John simply say that he is a man dressed in white. Matthew and Luke say that his appearance was like lightening. As a matter of fact, Luke and John say that there were two men inside the tomb, but that's beside the point. From what it seems, all the accounts of Jesus appearing to people and ascending into heaven were later additions to the gospels, because the earliest gospel (Mark) didn't contain them.
Just a thought.
Here's the video that I mentioned anyway