My only penny stock is SpaceDev Inc. (OTCBB: SPDV) and I am not recommending you buy any. I do not recommend any penny stocks and will leave that to others.

If you did buy some, it would probably move the stock because the trading volume is so low that you can actually have an impact. I'm losing a few hundred dollars over the course of about two years.

I bought the company after I had witnessed both launches of Space Ship One into sub-orbital space and wanted to keep track of this interesting company that created the motor and fuel technology.

This week, the company announced that its devices successfully landed on Mars. SpaceDev "provided a wide array of hardware and instruments for the Phoenix Lander that successfully landed on Mars' north arctic plane Sunday, May 25th at 4:53 pm PDT."

SPDV closed Wednesday at $0.62, unchanged. Its 52 week range is $0.51 to $1.05. There are no significant metrics worthy of discussion, but as a shareholder I am supporting an important aerospace company that is designing and building cutting edge space-age technology and keeping me informed and educated. It is located in Southern California, allowing me the opportunity to visit the company easily.

There is little chance of a big financial reward, unless one of its technologies finds some broad popular use, but sometimes there are other things in life that mean more.

Sheldon Liber is the CEO of a small private investment company and the principal for design and research at an architecture & planning firm. He writes the columns Chasing Value and Serious Money. Disclosure: I own shares of SPDV.