Wuji Technology, based in Shanghai, is one of those firms.
Scientists warn that the debris is congesting space and threatens collision with rockets, the International Space Station, and our planet.
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Both of the surgeons the BBC talked to also agree that it is important for patients to speak to their healthcare professional about the benefits or risks of the drugs.
Isaacman said SpaceX and Blue Origin are "both looking to do uncrewed landing demonstrations as part of the existing agreement."