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Defence firm Lockheed Martin is understood to be working on a state-of-the-art spy plane for the US Air Force, which could reach over 4,600mph.

Google Earth images have now surfaced of an object bearing a startling similarity to artist’s impressions of the plane.

The silvery shape was spotted at the end of a runway in the swamplands of the Sunshine State, US.

According to Tyler Glockner – who uploaded the clip to his YouTube channel secureteam10 – the area belongs to an aerospace company that has a “main foothold in designing aircraft engines that are widely used in civilian and military aviation”.

“That gives us a hint they work with secretive things,” he added.

(Image: YOUTUBE)

“What you’re seeing is a very mysterious object.

“I haven’t been able to find out what this is.

“It is no public aircraft that has been disclosed.

“You can see that this thing looks like a hypersonic aircraft or spacecraft.”

More than 390,000 people have seen the clip and were quick to offer their suggestions.

“Definitely seems to match the images of that fast jet, but why would they leave it in the open?” one asked.

Another agreed, saying: “Not very secret if they're out in the open for anyone to see!”

But a third wrote: “These look like powerboats, could be something else but there is a massive lake not far away.”

The craft's 4,600mph top speed offers nothing in comparison to NASA's new unbelievably fast machine, however.