Commercial interest in outer space is taking off, as cheaper launches and satellites make the final frontier more accessible than ever. Tech billionaires like Amazon (AMZN) CEO Jeff Bezo’s Blue Origin, Tesla (TSLA) CEO Elon Musk’s SpaceX, and Microsoft (MSFT) co-founder Paul Allen’s Stratolaunch Systems are challenging established players like Boeing (BA) and Lockheed Martin (LMT), who have teamed up for the United Launch Alliance joint venture.

X Meanwhile, new constellations of satellites are due to enter low-Earth orbit in the coming years, and venture capital money is pouring into space startups.

But space is also expected to become a new battleground in future conflicts, and the U.S. military is preparing for emerging threats from China and Russia.

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