Questions over whether SpaceX will live up to its colossal share price.
Shares soared above $160 US dollars as the rocket, satellite and data centre company hit the market yesterday.
It's sent Elon Musk skyrocketing to trillionaire status - a world first.
Eric Berger, who's authored two books about Musk, says it's still a risky investment for those buying in - partly due to Musk's erratic personality.
"You're betting on the company being able to get Starship, the rocket, flying rapidly and safely - and then build an enormous consolidation of data centres in space."
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