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This included issues with some of Starliner's thrusters, which would be needed to slow the spacecraft for re-entry into the Earth's atmosphere, and leaks of helium gas in the propulsion system.

Even though the tails lash back and forth while the rays swim, they are not used for propulsion; similarly, they are not used to kill prey or thwart predators.

Last week, researchers at the Middlebury Institute of International Studies in California found satellite images that indicate China is working on nuclear propulsion for a new aircraft carrier.

The episodes unfold with the thrilling speed and sense of unnerving propulsion, but there’s also space for the audience to better understand what drives the assassin and the spy who’s looking for him.

After launching in June following repeated delays, the capsule returned remotely and uncrewed due to problems with its propulsion system.