A major effect of long-term weightlessness involves the loss of bone and muscle mass. Without the effects of gravity, skeletal muscle is no longer required to maintain posture and the muscle groups used in moving around in a weightless environment differ from those required in terrestrial locomotion.
Marina /ma-ri-na/ [3 sylls.] as a girls' name is pronounced mah-REE-nah. It is of Latin origin, and the meaning of Marina is from the sea. From marine. A saint's name. Shakespeare gave the name to Pericles' daughter in his play Pericles, Prince of Tyre.
First attested in English in the early 14th century, the word navy came via Old French navie, fleet of ships, from the Latin navigium, a vessel, a ship, bark, boat, from navis, ship. The word naval came from Latin navalis, pertaining to ship; cf. Greek Î½Î±á¿¦Ï (naus), ship, Î½Î±ÏÏÎ·Ï (nautes), seaman, sailor. The earliest attested form of the word is in the Mycenaean Greek compound word ðððð , na-u-do-mo (* naudomoi), shipbuilders, written in Linear B syllabic script.