Your argument is invalid since you incorrectly assume that: - all known chemistry is all there is to know about chemistry, thus there is no basis to state all

Your argument is invalid since you incorrectly assume that: - all known chemistry is all there is to know about chemistry, thus there is no basis to state all life must be organic - it's impossible biological systems can be made sufficiently error correcting, by technological or other means - conventional travel is the only form of space travel