Greek mythology in popular culture elements tantalum and niobium are always found together in nature, and have been named after the King Tantalus and his daughter Niobe. The element promethium also draws its name from Greek mythology, as does titanium, which was named after the titans who in mythology were locked away far underground, which reflected the difficulty of extracting titanium from ore. The U.S. Apollo Space Program to take astronauts to the moon, was named after Apollo, based the god's ability as an archer to hit his target and being the god of light and knowledge. Oceanographer Jacques-Yves Cousteau named his research ship, a
Orion (mythology) Mercury. Modern mythographers have seen the story of Orion as a way to access local folk tales and cultic practices directly without the interference of ancient high culture; several of them have explained Orion, each through his own interpretation of Greek prehistory and of how Greek mythology represents it. There are some points of general agreement between them: for example, that the attack on Opis is an attack on Artemis, for Opis is one of the names of Artemis. There was a movement in the late nineteenth century to interpret all the Boeotian heroes as merely personifications of the constellations;