Astral Projection (AP) and Out-of-Body Experiences (OBEs) are topics confined to our Beyond Dreaming forum. The main difference between them and lucid dreams is that lucid dreams are scientifically proven, while it's mostly impossible to prove or disprove the existence of AP and OBEs. For some, they are just more detailed lucid dreams, but for others they are spiritual experiences of enlightenment.

I'm not going to stand here and tell you whether they do or don't exist (frankly because I don't know myself). I will tell you however that if you're not specifically trying for them, it's incredibly unlikely that you'll experience one while trying to lucid dream.