Triangular-shaped object with white lights and one red light above the tree line at Red Rock Canyon,Las VegasOn August 17, 2012 I was attending an outdoor play at Spring Mountain Ranch in Red Rock Canyon, Las Vegas, Nevada. The play began at 8:00 p.m. under a somewhat cloudy sky threatening rain later on. At about 8:15p.m.-8:30p.m., an object between two trees to my right appeared in the sky above tree level.The object was about the size of my hand with my arm extended toward it, an equilateral triangle in shape, dome-shaped white lights formed a row around the inside dark perimeter of the triangle with a red dome light in the center. Against the grey cloudy sky the object was solid and a darker black-grey reminding me of the skin of the Stealth Plane.The object moved from the N/NW going in a S/SE direction. I lost sight of it behind two trees, but it re-appeared again about 60 seconds later. It seemed to be traveling rather slowly and flat so the visible area was the triangle with the lights below which stayed on continuously. There was no sound.It moved beyond my vision and though I watched the sky the remainder of the play until @ 9:15 p.m., I didn’t observe any other unusual occurrence. I was amazed at the lack of response by the people around me who clearly saw the object then just continued to watch the play. A woman next to me said she saw the object and thought it was “just a UFO.”