(Encyclopedia) Major Planets of the Solar System
Planet
Distance from the sun
(AU)
Period of revolution
Period of rotation
Mass
(earth=1)
Diameter
(earth=1)
Number of confirmed satellites…
(Encyclopedia) scandiumscandiumskănˈdēəm [key], metallic chemical element; symbol Sc; at. no. 21; at. wt. 44.95591; m.p. 1,541℃; b.p. 2,831℃; sp. gr. 2.99 at 20℃; valence +3. Scandium is a soft…
(Encyclopedia) planetary science or planetology, study of planets and planetary systems as a whole. Planetary science applies the theories and methods of traditional disciplines such as astronomy,…
(Encyclopedia) stratigraphy, branch of geology specifically concerned with the arrangement of layered rocks (see stratification). Stratigraphy is based on the law of superposition, which states that…
Early Theories of EvolutionHistorical Development and Mechanisms of Evolution and Natural SelectionIntroductionEarly Theories of EvolutionNatural Selection and EvolutionNatural-Selection Mechanisms…
Apollo Moon Mission display in the National Air and Space museum HOW DO HUMANS SURVIVE IN SPACE? HOW DOES SPACE TRAVEL AFFECT PEOPLE? WHAT IS THE FARTHEST ANYONE HAS TRAVELED IN SPACE?…
The Right StuffPioneer John Glenn Returns to Space by Michael Morrison Is there anything John Glenn can't do? College graduate, distinguished war hero, the first American to orbit the earth,…
The Search for Life in the Solar System by Tim Porter While generations of cloned mice and asteroids the size of Texas dominate science in popular culture today, a NASA probe is quietly…
THE BIRTH OF THE SOLAR SYSTEMPLANETSMOONSOur tiny corner of the Universe is dominated by a star we call the Sun. Trapped in the gravity of the Sun is a huge family of bodies – PLANETS…
