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.
The Queen allowed her to use the title Princess Alice, Duchess of Gloucester as a courtesy it did not make her a princess in her own right. Marina was a Princess of Greece and Denmark but that does not qualify one to use the title Princess before their christian name as a member of the British Royal Family.