Who is the only pre-teen that has traveled to outer space? Sort of a trick question. But also not quite a trick question. This is a person, not a dog or chimpanzee or other animal.
Building off Prim3numbah's response, I reason that the answer is again
Where Prim3numbah messed up in their reasoning:
While Jack Lousma did travel to outer space in April 1966, he was the commander of STS-3 starting from March 22 - 30 1982, at which time he would have been 11! This qualifies for the definition of pre-teen being from 10 - 12.
I suspect this puzzle was posted today because:
This week started on March 22nd, which is also the first day that Jack Lousma spent as Commander on STS-3.