2 luminescent glowing forms criss-crossing across the night sky.2 glowing shapes flying across the sky at super speed, but very low to the ground. It wasn't lights but more of a luminescent glow that was very dim. There was nothing flashing, no blinking lights, just the 2 glows. I couldn't really tell any shapes of a spacecraft, only the glow. They were going very close to the ground, maybe 30-50 feet up. As they passed above me, they crossed each other like they were swapping places...right glow to the left, left glow to the right, and just speed off across the sky. They were absolutly silent as I remember hearing nothing but the grass crunching under my feet as I stared at them in awe. I've seen hundreds of airplanes cross the sky where I was, and have never seen anything that you couldn't tell was a plane by the blinking colored lights and visual shape of the plane. Not to mention it was far to close to the ground.