When it comes to space investing, there's no company more popular than SpaceX. For investors, though, the problem is that SpaceX is a private company and so -- aside from possibly owning a small portion of it vicariously through Alphabet stock -- there's no direct way to invest in SpaceX.

But are you even sure you would want to invest in SpaceX? In addition to being difficult to buy, the Securities and Exchange Commission (SEC) doesn't require private companies like SpaceX to disclose their financials. So even if you were able to buy SpaceX stock, you wouldn't know much about what you were getting -- no clear idea of how much revenue SpaceX takes in, in a year, and certainly no idea about how profitable that revenue is for SpaceX.

But that's not a problem with SpaceX's little brother in space, Rocket Lab USA (NASDAQ: RKLB). Investors know precisely how profitable Rocket Lab is -- and they have a pretty good idea how profitable it wants to become.

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Source Fool.com