Shares of upstart space tourism pioneer Virgin Galactic Holdings (NYSE: SPCE) are up 11% since January on hopes that the company's planned launch of commercial flights in the coming months will bring in much-needed revenue.

But rather than getting ready to go to the Moon, investors should be cautious. The stock's recent run could end up as a failure to launch. While initiating commercial flights is a critical step in the right direction, it could bring new challenges.

Here is why investors should consider staying on the sidelines for at least the next several quarters.

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Source Fool.com