When most people think of clouds, they imagine fluffy cotton-ball cumulus clouds, wispy cirrus, or towering, dark cumulonimbus thunderheads. Anything else in the sky seems….well, a touch unusual. Space experts have made a list of the most common objects mistaken for UFOs. They include airplanes, lights on towers, the moon, stars, and even clouds.

Yes, clouds. Like this one, dramatically filmed in the midst of a lightning storm in Austin, Texas.

In this video (and several others like it), a cascade of lightning strikes lights up the night sky, illuminating a long, curved silver shape in the sky. Is it a flying saucer? The alien mothership we’ve heard so much about?

Nah. It’s just a shelf cloud.

So called because they look like a long shelf (or often shelves), shelf clouds are commonly mistaken for UFOs because they look like the stereotypical silver flying saucer. Shelf clouds are often seen at the leading edge of severe storm fronts (as seen here), and appear to be “rolling in,” turning on a horizontal access, as the saying goes.

For other UFO enthusiasts: There are five observations often made of true UFOS (or UAPS): Anti gravity lift, sudden acceleration, silent hypersonic velocities, cloaking, and trans-medium motion. This “UFO” only displayed the “anti gravity” lift, but then again, so do all clouds.

Check it out at Exemplore