Bright light moving from west to east, which went from the horizon to directly overhead in less than a minute, with no sound.My husband and I were sitting on the front porch of our home (which we have done nightly for yrs). We observed a bright light come over the horizon above the tree line, moving at a tremendous speed. Initially we assumed it to be a low flying jet aircraft (rarely are any aircraft other than small private planes seen in this area at all)due to the extreme speed. The light came from a true north bearing of 268 degrees (my husband deals with map and compass locations on a daily basis), travelling almost due east (true bearing). As the light approached us, we expected to hear the engine of a possible military aircraft due to the fact that Fairchild AFB is approx. 80 miles SW of our location. When the light was directly overhead, it began to fade and finally disappeared. In spite of the fact that we waited a number of minutes, there was no sound whatsoever. It should be noted that our home is located in a very rural area, and the ambient sound is almost non-existant. We have absolutely no idea what we saw, but we have never seen anything like this before. We have lived at this location for 11 yrs.