A number of TV and movie series in the science fiction and fantasy genres have specified canon. This tells us what is absolutely true in that world/universe and what may be legends or could be true but is unproven, and what is simply not an official part of that universe.
Is there any determination for Lost in Space what is canon? Naturally the original series would be canon. What about the comic books? Is Lost in Space Forever considered canon or just a fun follow-up?
If there is a rule for what is and isn't canon, where did that rule come from and, if there isn't, who would have the authority to state, now, since both Irwin Allen and his wife are dead? Would Bill Mumy, for example, who has been quite active in conventions and with other projects, have the authority to state what is and isn't canon at this point?