The hitchhiker's guide to Musk's SpaceX memo

Elon Musk is a science nerd. His latest memo is another glaring example.

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• Elon Musk's merger memo is filled with high-level space and science jargon — and a Musk-favorite phrase.
• "Sentient sun," "Kardashev II-level," and "electromagnetic mass driver." What do they even mean?
• Here's your cheat sheet for Musk's space-age lingo.

Elon Musk has never been shy about his inner nerd — just look at his SpaceX merger memo.

Over the years...