How many of those just learning of Google co- founder Sergey Brin’s deposit of $5 million for the rare adventure of seeing outer space as soon as 2011 are a greenish hue of envious?

Space tourism company Space Adventures said Wednesday the Google legend had already made a $5 million down payment to book a seat on a future private space flight that could take place as early as 2011.

So Brin could well celebrate his 38th anniversary (he is born in 1973) in outer space…with the planets and stars. Imagine that!

Space Adventures CEO Eric Anderson made the interesting announcement during a press conference in New York, reports Reuters. He explained that the full price Brin would probably end up paying for his extravagant adventure will be approximately $35 million.

Brin is predictably not the only passionate person with the indispensable means to accomplish such a dream. Anderson said an Orbital Mission Explorers Circle of members had been created.

These members are willing to contribute $5 million each in order to help finance the company’s first private mission to the International Space Station (ISS).

Space Adventures has even bigger plans: the company intends to build its own Soyuz rocket for private missions. These could start as early as three years from now. Brin may well be one of the first two passengers of the first flight.

Space Adventures, a Virginia-based company, has already sent five tourists to space on Soyuz missions. This number is sure to grow once the company succeeds in its goal of sending one mission to the space station per year, with two clients on each flight.

 Brin, who famously toiled for his dreams of launching Google in a rented garage, is nowadays estimated to have a net worth of $18.7 billion, according to Forbes’ calculations, ranking 32nd among the world’s wealthiest persons.