(Encyclopedia) albedoalbedoălbēˈdō [key], reflectivity of the surface of a planet, moon, asteroid, or other celestial body that does not shine by its own light. Albedo is measured as the fraction of…
(Encyclopedia) EnceladusEnceladusĕnsĕlˈədəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn II (or S2), Enceladus is 310 mi (500 km) in diameter,…
(Encyclopedia) month, in chronology, the conventional period of a lunation, i.e., passage of the moon through all its phases. It is usually computed at approximately 29 or 30 days. For the…
Formation of the Solar System The Sun The Moon The Moon's Phases Some Facts about Eclipses Mercury Planet Mercury Video Venus Earth Mars Planet Mars Video and Activities Jupiter…
EXPLORING THE MOONFIRST SPACEMANFIRST MEN ON THE MOONMISSION CONTROLSPACE SHUTTLETO SPACE AND BACKFIND OUT MORELess than four years after the launch of the first satellite into space, Sputnik 1…
(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) 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…
