You might as well look at gravitation and conclude that virtue consists of proximity to large massive objects.
But of course it does! It's not by accident that expressions "head in the clouds" or "flighty" signal disapproval, while "has his feet firmly planted on the ground" is praise :-D
Indeed, "gravity" means serious thought or speech, as opposed to "levity". Weightiness is also good.
I noticed that there has been some earlier discussion about Sam Harris’s Moral Landscape Challenge here at LW. As a writer on the Swedish politico-philosophical blog The Inverted Fable of Reality, I would like to share a response to the challenge, written by our main contributor, which I believe is interesting to read even if you are not familiar with The Moral Landscape or its content. See this link for the response and a short explanation of the challenge.
The response takes a different approach to most responses to the challenge. It is divided into four parts and starts by asking which ethic is most compatible with science and reality and finally tries to answer this question.