The 35-years old Brin is the first member of Space Adventures’ Founding Explorer group, a programme started by the commercial space flight company Space Adventures.

"I am a big believer in the exploration and commercial development of the space frontier, and am looking forward to the possibility of going into space," said Brin .

"Space Adventures helped open the space frontier to private citizens and thus pave the way for the personal spaceflight industry. The Orbital Mission Explorers Circle enables me to make an immediate investment while preserving the option to participate in a future spaceflight."

However, the $5 million is just a small token, as it is estimated that the total cost of the trip will be of around $35 million for each of the 6 passengers.

Brin is not the first top executive to pay a deep interest to space exploration. Former Microsoft top exec Charles Simonyi paid $20 million for his trip last year. Also, Virgin founder Richard Branson is already a known figure in the field of space exploration and chances are that he as well will take a trip in the near future.