VERY LARGE OBJECT- WHITE LIGHT ILLUMINATING MY BACK YARD HOVERING ABOVE THE TREE LINE IN MY BACK YARD BACK YARD

I WAS APPROX 15-YRS OLD THE YEAR WAS 1976. I DO NOT REMEMBER THE EXACT DATE. I DO NOT REMEMBER THE EXACT TIME ... IT WAS BETWEEN 8:PM-10:PM (I KNOW IT WAS DARK OUT AND RIGHT BEFORE MY BED TIME) MY FAMILY AND I LIVED OUT IN THE COUNTRY 9- MILES FROM THE TOWN OF ANOKA, MN.  WE WERE ALL WATCHING TELEVISION IN THE FRONT LIVING ROOM WHICH FACED DUE WEST.
AS I ENTERED MY BEDROOM (LOCATED ON THE SOUTH EAST SIDE OF HOUSE) I NOTICED FROM MY BEDROOM WINDOW, A VERY BRIGHT WHITE LIGHT HOVERING ABOVE THE TREE LINE IN MY BACK YARD.  (TREE LINE APPROX 50- YARDS DUE EAST FROM HOUSE) THE OBJECT WAS VERY LARGE AND OVAL IN SHAPE.  I DIDN'T HEAR ANY NOISE COMING FROM THE OBJECT.  I WAS SO SCARED THAT I COULDN'T SPEAK OR MOVE. THE HAIRS ON MY ARMS WERE STANDING STRAIGHT UP, AS THEY ARE DOING NOW AS I AM  RELATING  THIS EXPERIENCE. THE BRIGHT LIGHT HOVERED IN AN UP AND DOWN MOTION FOR APPROX 5- MINUTES JUST ABOVE THE TREE LINE. THEN ALL OF A SUDDEN THE OBJECT TOOK OFF INTO SPACE IN A SLANT MOTION (SOUTH EAST) AND WITHIN SECONDS THE OBJECT DISAPPEARED.
I KNOW WITH THE TECHNOLOGY AT THAT TIME THERE IS NOTHING ON THIS EART THAT IS MAN MADE THAT CAN MOVE OR HOVER IN AN UP AND DOWN MOTION WITHOUT MAKING A SOUND, NOR ANYTHING THAT CAN MOVE SO FAST AND DISAPPEAR INTO SPACE WITHIN SECONDS.