About 7:20pm I was about to point out a commercial jet (low, just overhead & going north) to my 3-year-old, when I saw a very bright, silverish tube-shaped thing higher up and to the southeast, heading southwest. I thought it might be a plane fuselage reflecting the sun (which had just set), but it was brighter than any plane I'd seen.I watched it closely and saw no wings or blinking nav lights. There was no sound (though a faint sound probably couldn't be distinguished from nearby traffic noise).I thought it was strange looking compared to the aircraft I've seen, and watched it closely. Afterward we went inside and I checked Wolfram Alpha for planes overhead, it listed two commercial jets and three cessna-type planes near the horizon, but this didn't look like any of those.It didn't get closer to the horizon as it receded (as a plane keeping a consistent altitude will do). It just kept going in a straight line until it faded from view, at about a 70-degree angle in the southwest.