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MOORE, Okla. – Residents in Moore and southwest Oklahoma City took to Facebook after hearing a loud rumble and roar early Monday morning.

Some thought it was an earthquake while others had their own theories, like UFOs and aliens.

The sound Chris Martinez hears often in his Moore neighborhood is an unforgettable ringing.

Martinez said, “It’s a loud sound then it completely stops.”

Austin Holland, with the Oklahoma Geological Survey, said,”We looked at our seismic records and there’s nothing that would indicate that this was associated with ground motion.”

After ruling out an earthquake, seismologists said the sound could have traveled from somewhere else.

Experts said if it’s a quick shaking, it’s an earthquake.

If it’s a large rumbling, it could be a big plane.

However, residents in the area have their own theory.

Martinez said, “I’m crazy. I think there are starships. I think there’s some cool space ships that not a lot of people know about.”

He said every time this odd buzz comes around, the dogs in the neighborhood get riled up.

Martinez said, “Whenever they distinguish a different sound, it makes them feel uncomfortable. They have a weird sense about that.”

For those who might think Martinez is crazy, he said through research and personal experience, star ships and spaceships are possible.

Others have a different idea.

Holland said, “When you have really cold weather or odd atmospheric conditions, sound can get around, traveling much better in the atmosphere than it normally does.”

Martinez said, “You have different weird things in the sky, you have these weird sounds, you put two and two together and realize, um maybe we don’t know everything.”

Either way, it’s a sound that still remains a mystery.

We did reach out to the Moore Police Department to see if they received any calls about the odd sound early Monday morning.

However, they were not aware of the noise.