Lance, who's recently finished a tour with N'Sync, is now having more tests at Russia's Star City cosmonaut space centre.
And even if he gets through, the trip won't come cheap. The short space flight costs a whopping £20m.
He'll have to go through an intensive six-month training course, which mean N'Sync will be down to four for a while.
But Lance is determined to succeed. His spokeswoman said it was his life-long dream to go into orbit, and that he even went to 'space camp' as a kid.