on clear nights i almost always look at the sky while walking the dog(s), usually around 8pm. there is a good field of vision for most of the sky here and it was a clear night. i've done this for the 23 years i've lived here. i'm now 72 year old. (when someone says they are 72 years 'young' they're not being completely honest. when i turned to go back to the house my eye was caught by a light and movement about 15 degrees off the ground. i stopped and observed an object sse of me, more than car sized, glowing steady white (a soft glow) and moving from my left to right, 500 to 1,000 feet distant, about 500 feet off the ground. i seemed to be 20-30 feet long, 5-7 feet high and of indeterminable width, but i didn't get the impression that it was disk shaped.The front may have been 20 leveled, like the front of a car. there was no indication of windows or any projections from the body.. the front and back were roundish. there was no sound, not even background sound as it is very quiet in my neighborhood. it was moving straight and level at maybe 50 but not over 70 mph. the sighting lasted about 15 seconds, perhaps less when it passed behind the trees on the front of my property. it seemed to me like someone just out for a drive. i have never seen a ufo before. i mentioned it to my wife when i went inside. that's all there was to it.