object spotted, triangular in shape, 3 glowing red/amber lights, silent, 25 to 30 feet in length, made movements not possible to planesI was awake and surfing the web when my dog who was in his cage at the back of the house started making a strange yelping sound. I went to the back to see what was causing him to behave this way. I opened the back door to see what was going on and at first I did not see anything out of the ordinary.Then out of the corner of my eye I noticed movement at about the 10 o clock position. There was an object in the sky hovering pretty low I would say at the height of about a 7 story building. I would estimate that it was around 25 to 30 feet in length. It was triangular in shape and had a faint glowing light of a light red/amber color in each corner of the object (3 lights total). It made no sound at all, it just seemed to be stuck there not moving at all.I was becoming rather fearful at this strange sight, but my curiosity got the better of me and I stepped off my back deck/step to get a better look and just as I did this the object began to move. It moved slowly at first still without making a sound then it started doing something really strange it seemed to vanish and then reappear at a different place, it did this for a short time (less than 10 seconds) then shot off at a very high speed to the north. All the while it did not make a single sound. I was unable to see what color the object was but there were reflections of city lights on it so it was a shiny surface.The shape as I said was triangular but not perfectly triangular it was like the points of the triangle were cut off.