Yes. Water is made up of two hydrogen and an oxygern atom is a different fact than the earth and venus are nearly the same size. It does not bring science to its knees.
And the next time someone says that there are astronomical facts about the chemical make-up of water I will correct them as well. Which is to say I don't know what your point is and can only imagine you think I am arguing for something I am not. Perhaps it's worth clarifying things before we get glib?
Do you believe in an objective morality capable of being scientifically investigated (a la Sam Harris *or others*), or are you a moral nihilist/relativist? There seems to be some division on this point. I would have thought Less Wrong to be well in the former camp.
Edit: There seems to be some confusion - when I say "an objective morality capable of being scientifically investigated (a la Sam Harris *or others*)" - I do NOT mean something like a "one true, universal, metaphysical morality for all mind-designs" like the Socratic/Platonic Form of Good or any such nonsense. I just mean something in reality that's mind-independent - in the sense that it is hard-wired, e.g. by evolution, and thus independent/prior to any later knowledge or cognitive content - and thus can be investigated scientifically. It is a definite "is" from which we can make true "ought" statements relative to that "is". See drethelin's comment and my analysis of Clippy.