I appreciate these are translations, but that phrase is meaningless. You can't say "more less than" (ie: twice as less as hot) and even worse "x times less" unless you're comparing two things against a third.
Perhaps the translator meant "less than half as hot"?
After twenty years of research, astronomers have just discovered a planet which looks remarkably like Earth. And that's not all, because further studies will be needed to determine whether life has developed there.