Why Stand There Looking Up into the Sky?

Readings:
II Kings 23
Acts 1:9-11

Focus:
Acts 1:10b-11a:"...all at once there stood beside them two men robed in white, who said, 'Men of Galilee, why stand there looking up into the sky?'"

When Jesus ascended to heaven, the disciples were stunned and gazed after him, undoubtedly trying to figure out what exactly had happened. But the angels who appeared to them after that directed them as to what they should actually be focusing on: they should not be concentrating on where Jesus has gone, but rather they should be moving forward and doing the work that Jesus has left for them.

That is true for us as well. We should not spend our main focus speculating on the details of how and when Jesus will return, but rather we should spend our main focus doing his work here before he returns. Why stand there looking up into the sky?