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It is unlikely this exact aircraft will be produced in large numbers, but experts say all countries are exploring uncrewed aircraft urgently.

Thursday's uncrewed launch was Starship's seventh test mission, and the first involving a taller, upgraded version of the rocket.

The uncrewed Falcon 9 launched from the Kennedy Space Center on Wednesday.

The US military also said it struck "multiple Houthi one-way attack uncrewed aerial vehicles, or drones, and an anti-ship cruise missile over the Red Sea".

As the mystery persists, state governments are calling for more power to deal with the small, uncrewed aircraft being spotted in the skies.