Billionaire Elon Musk has countered president Donald Trump's threat to "terminate Elon’s Governmental Subsidies and Contracts," in spectacular fashion: by threatening to cut off the United States' access to outer space.

"In light of the President’s statement about cancellation of my government contracts, SpaceX will begin decommissioning its Dragon spacecraft immediately," Musk tweeted.

If Musk were to make good on his threat, the United States' space program could experience an enormous setback of epic proportions. SpaceX's Dragon spacecraft has quickly become the de facto method for NASA astronauts to travel to the International Space Station.

In other words, American astronauts could soon be prevented from visiting the space station — especially considering that the only other option

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