CNBC's Jim Cramer said it's not too late to buy SpaceX if investors view the company as a long-term bet on space exploration.

CNBC's Jim Cramer said one of the biggest risks facing the SpaceX IPO is speculators who may rush to sell shares shortly after the stock begins trading.

CNBC's Jim Cramer warned that overwhelming demand for SpaceX could send the stock to unsustainable levels after it begins trading.