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
Artemis worshipped as a fertility/childbirth goddess in some places, assimilating Ilithyia, since, according to some myths, she assisted her mother in the delivery of her twin. During the Classical period in Athens, she was identified with Hecate. Artemis also assimilated Caryatis (Carya). As Aeginaea, she was worshipped in Sparta; the name means either huntress of chamois, or the wielder of the javelin (). Also in Sparta, Artemis "Lygodesma" was worshipped. This epithet means "willow-bound" from the Gr. "lygos" (λυγός, willow) and "desmos" (δεσμός, bond). The willow tree appears in several ancient Greek myths and rituals. She was worshipped at Naupactus as