once, i was 12 i think, i saw a non-blinking white dot travel past the night sky. not too fast even, but certainly faster than an airplane.
and no, it wasn't an airplane - i recognized the quadrilateral combo of lights, and the one blinking light in the middle, even back then.
I thought it was a satellite.
the movement was too uniform for it to be something non-manmade or at least not-intelligently maneuvered. it travelled in a straight line so it couldn't have been an alien ufo either.
so, i guess tl;dr of this post - as per my personal experience, some satellites are visible to naked eye at night because they shine bright like a planet/star like heavenly body.