Elon Musk is building a spaceship that’s so ambitious, some experts call it ‘science fiction.’ Here’s what SpaceX and its engineers are up against.

Elon Musk plans to blast a tourist around the moon in a ship made by his rocket company, SpaceX. The private lunar mission is meant to demonstrate a new two-part launch system called Big Falcon Rocket, which is designed to eventually bring humans to Mars. Engineers are said to be building a prototype of the BFR’s spaceship primarily out of carbon-fiber composites. Exactly how SpaceX is building that spaceship isn’t publicly known, but industry

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