The process in which the anatomical structures of an aorta are generated and organized. An aorta is an artery that carries blood from the heart to other parts of the body. [ http://purl.obolibrary.org/obo/UBERON_0000947 http://en.wikipedia.org/wiki/Aorta http://www.informatics.jax.org/searches/AMA.cgi?id=MA:0000062 GOC:dgh GOC:bf ]