Two extremely bright lights appear quickly high in the sky and disappear as fast.

Was standing outside in backyard with the dog.  Looked up in the sky, south and west of Mars, I saw two positions that at first I thought were distant stars. Then the brightness of them increased in intensity and they were extremely bright and white, no blinking or other colors. After fifteen or twenty seconds, they began to fade and as they were fading, they to go up and away, out of sight as fast as they appeared.