What is this thing called Metaethics?

What makes something morally right? Where do our ethical standards come from? Are they relative to cultures or timeless and universal? Are there any objective moral facts? What is goodness? If there are moral facts, how do we learn about them? What do we mean when we say someone ought to do something? These are all questions in metaethics, the branch of ethics that investigates the status of morality, the nature of ethical value, the possibility of ethical knowledge, and the meaning of ethi...