Large bright white light with a long tail arcs across sky at Grand Canyon.It was dusk, still quite light out, and my brother and I witnessed a very large moon size bright white light with a long tail arc across the sky right in front of us. It was so close that we thought it landed somewhere and actually drove around looking for evidence. We were driving on the main road out of Grand Canyon National Park on the south rim. When we looked behind us after the arc disappeared we witnessed two fighter planes accelerating strait up (and leaving contrails) from somewhere on the north rim of the Grand Canyon.