Nope, it's not conjecture, Royd. Theory, yes -- but I suspect that your definition of "theory" is the one used by so many outside of science. Here is a link to a very good site defining "hypothesis," "theory" and "law" as scientists and mathematicians use those terms:
http://chemistry.about.com/od/chemistry101/a/lawtheory.htm
Science is not a religion, it is a METHOD of extracting information/data through methodical processes that -- if used in its pure objective form will eliminate the impossible. What is left, how improbable it may seem, is most very likely gonna be the truth. Conan Doyle said something along those lines.
http://chemistry.about.com/od/chemistry101/a/lawtheory.htm
Science is not a religion, it is a METHOD of extracting information/data through methodical processes that -- if used in its pure objective form will eliminate the impossible. What is left, how improbable it may seem, is most very likely gonna be the truth. Conan Doyle said something along those lines.

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