While driving to idaho in the desert i witnessed a hovering object in the sky, it hovered for a few seconds and changed directions unlike anything a plane could do . at then turned into what looked like a fireball and very quickly descended diagonally to the ground behind a mountain. i drove around and try to see if i could find where it landed or crashed there were no signs of anything. although it could've been a lot farther away than i could tell the whole incident lasted maybe 5:10 seconds. i did not have time to get pictures. i'm just very curious what they say is or was. it has been on my mind since i saw it