Outside with the dog and observed a very bright light to the southwest. assumed this light was a plane on approach to dia as i live along the flight path and always see planes when i'm outside. as it got closer it appeared to slow a little and i marveled at how bright it was and that it appeared to have a cross shape, although the cross wasn't oriented to the direction of travel. i thought the shape was caused by a flare on my glasses but when i took them off to look it still had the same shape. as the light came overhead i couldn't see any navigation lights or hear any sound. there was a jet on a different path flying in the opposite direction and it's navigation lights were clearly visible and the sound was distinct. once the light passed over it faded over a couple of seconds, had a brief reddish glow near the tip and then disappeard. i've observed both the shuttle and iss in the past and this light was far brighter than what i remember them being. it also appeared to be at a much lower altitude than the jet but it was extremely hard to tell due to how bright it was. i've spent a lot of time watching the sky and i'm baffled at what this was.