Standard atmospheric pressure at sea level on Earth.Īurora A glow in a planet's ionosphere caused by the interaction between the It has no particular meaning except that asteroid N+1 was discoveredĪstronomical unit (AU) The average distance from the Earth to the Sun ġ AU is 149,597,870 kilometers (92,960,116 miles).Ītmosphere One atmosphere is 14.7 pounds per square inch
DEF OF TIDAL HEATING SERIAL NUMBER
Particle is defined to have a diameter of less than 2 millimeters.Īsteroid number Asteroids are assigned a serial number when they are discovered Partly fill the crater or blankets its outer flanks after the impactĪlpha Centauri The closest bright star to our solar system.Īntipodal point The point that is directly on the opposite side of the planet e.g., theĮarth's north pole is antipodal to its south pole.Īphelion The point in its orbit where a planet is farthest from the Sun.Īpoapsis The point in orbit farthest from the planet.Īpogee The point in orbit farthest from the Earth.Īsh The fine-grained material produced by a Out of the crater during its formation that either falls back to That might not be a geological or topographical feature.Īllocthonous (1) Material that is formed or introduced from somewhere other Terms and Definitions Terms and DefinitionsĪccretion Accumulation of dust and gas into larger bodies.Īlbedo Reflectivity of an object ratio of reflected light to incident light.Īlbedo feature A dark or light marking on the surface of an object
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