Bright flying object - moved so fast backwards out of sight - made no sound

I was a student at the University of Cincinnati - studying late at night in the dorm towers - looking at the sky - saw a bright light in the sky - it grew brighter - and dimmed - there was no sound - I thought this is not a plane - no flashing lights or tail.  I starred thinking what is this.  I then saw it start to move slowly - one direction - stop and then fly directly back the other direction straight so fast it disappeared.