I was outside getting ready to go inside the house for the night as it was getting dark. I was outside trying to cool off a little when my eyes caught a light coming over the top of Mount Baker traveling to the west I thought. Then it changed direction and started coming down the side of the mountain very very rapidly. Several thousands of feet per minute I think. it leveled off and headed toward Bellingham Bay to the southwest. As it leveled out I could se that it was a triangle with bright light and maybe red orange lights on the sides.