Saw a shiny blueish silvery colored orb in sky driving down hwy 7 in Missouri Benton co. It was high in the sky, no vapor trail, did not move. Got real bright, faded, got bright again and vanished. No clouds in sky. It was around 7:00 pm. See lots of military aircraft from Whiteman AFB, but this didn't look military or even civilian. Lasted about 1 to 2 minutes.