(Encyclopedia) center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with…
(Encyclopedia) continent, largest unit of landmasses on the earth. The continents include Eurasia (conventionally regarded as two continents, Europe and Asia), Africa, North America, South America,…
WHAT IS THE MOON MADE OF? HOW DOES THE MOON AFFECT EARTH? PhasesFIND OUT MOREIn space, the closest object to Earth is the Moon. It orbits Earth, and appears to change shape as it moves—the…
(Encyclopedia) NutNutn&oobreve;t, nŭt [key], in Egyptian religion, sky-goddess. She was the sister-wife of the earth god Geb, to whom she bore Osiris, Isis, Set, and Nephthys. She was sometimes…
Water on Mars The scientific community was intrigued by the startling announcement in June 2000 that some high-resolution images of Mars taken by the Mars Global Surveyor showed strong evidence of…
(Encyclopedia) inclination, in astronomy, the angle of intersection between two planes, one of which is an orbital plane. The inclination of the plane of the moon's orbit is 5°9′ with respect to the…
(Encyclopedia) chemosynthesis, process in which carbohydrates are manufactured from carbon dioxide and water using chemical nutrients as the energy source, rather than the sunlight used for energy in…
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. If all of Earth time from the very beginning of the…
