NASA is confident that these, at least, did. (Of course, they could also have simultaneously been created terrestrially - but that doesn't change the fact that

NASA is confident that these, at least, did. (Of course, they could also have simultaneously been created terrestrially - but that doesn't change the fact that they were also created in space.) We have three lines of evidence that together give us confidence these DNA building blocks actually were created in space. (http://www.nasa.gov/topics/solarsystem/features/dna-meteorites.html http://www.nasa.gov/topics/solarsystem/features/dna-meteorit...)