(Encyclopedia) Phoebe, in Greek mythology, a Titan. She was the mother of Leto and Asteria and the grandmother of Artemis. In some legends she was identified with Artemis as the goddess of the moon.
(Encyclopedia) Pickering, William Henry, 1858–1938, American astronomer, b. Boston, grad. Massachusetts Institute of Technology (B.S., 1879). He taught at the Massachusetts Institute of Technology (…
(Encyclopedia) Brown, Margaret Wise, 1910–52, American children's book author, b. Brooklyn, N.Y., B.A Hollins College, 1932. Continuing her education at the Bureau of Educational Experiments (now the…
(Encyclopedia) escape velocity, the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun. A body given less than the escape…
(Encyclopedia) cycle, in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal…
(Encyclopedia) mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form…
