SpaceX, the rocket-launch company led by Elon Musk, is reportedly eyeing a public debut at a $1.5 trillion valuation. That’s likely good news for two members of the so-called Magnificent Seven. SpaceX ...

Discovering a machine that could somehow produce thrust without releasing propellant would be a game-changer for human space travel. There’s just one problem—such a device would defy the laws of ...

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