Triangular, 30ft wide, low floating over chilliwack city at night, no lights, no sound, translucent white; moved circle & straightUFO sighting in Chilliwack It just happened, at12:30 am on Monday, May 28th, 2007, over the UCFV campus in downtown Chilliwack...I overhead people shouting "oh god, it's coming back, what is it!?" so looked out the window and watched them for a minute... There were three people out on the street, looking towards the eastern night sky, so I peered closely to see what they were watching, as it approached...It was completely silent, and erriely glowing a light greyish-white color.It was very large, at least as big as a small aircraft, mayber 30 feet across... Triangular shaped, solid grey-white, but sort of translucent, and with faint darker ridges/fins running parallel down it's length, from 'nose' to 'tail'... It was without any sort of lights or noises...and was moving about the same speed as a glider would, but with more control - up and down, and around in tight circles, then in a straight line... it seemed to deliberately move to observe us remarking over it, as it circled above us for about 10 seconds, and moved away, then back again...long enough for me to grab my video camera and attempt to get some footage (just has black sky, and voices of witnesses freaking out) It circled around for about 20 more seconds, just low enough for the city lights to illuminate it to our vision, but high enough to be within the low overcast clouds...Then, quite quickly, rather than get progressively lower as a hang glider must, it moved away, rising up and to the west from us into the darkness... I don't believe in alien visitations, but have never seen anything like this before...any comments or ideas, or any other witnesses out there? I am completely mystified, and can't simply forget about it...