Planets

A planet is a spherical ball of rock and/or gas that orbits a star. The Earth is a planet. Our solar system has eightplanets. These planets are, in order of increasing average distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranusand Neptune. The only object visited by humans    other than the planet Earth is the Moon, which is not a planet. It is a satellite.



The International Astronomy Union has an official definition for a planet. It states, "A 'planet' is defined as a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit." Planetary and Space Science publishes original articles as well as short communications (letters). Ground-based and space-borne instrumentation and laboratory simulation of solar system processes are included.

celestial mechanics, including dynamical evolution of the solar system, gravitational captures and resonances, relativistic effects, tracking and dynamics. cosmochemistry and origin, including all aspects of the formation and initial physical and chemical evolution of the solar system. terrestrial planets and satellites, including the physics of the interiors, geology and morphology of the surfaces, tectonics, mineralogy and dating. outer planets and satellites, including formation and evolution, remote sensing at all wavelengths and in situ measurements. planetary atmospheres, including formation and evolution, circulation and meteorology, boundary layers, remote sensing and laboratory simulation.

planetary magnetospheres and ionospheres, including origin of magnetic fields, magnetospheric plasma and radiation belts, and their interaction with the sun, the solar wind and satellites. small bodies, dust and rings, including asteroids, comets and zodiacal light and their interaction with the solar radiation and the solar wind. exobiology, including origin of life, detection of planetary ecosystems and pre-biological phenomena in the solar system and laboratory simulations. extrasolar systems, including the detection and/or the detectability of exoplanets and planetary systems, their formation and evolution, the physical and chemical properties of the exoplanets.


Welcome to Planet Profiles:



Mercury Venus Earth Mars Jupiter
Mercury Venus Earth Mars Jupiter
Saturn Uranus Neptune pluto
Saturn Uranus Neptune Pluto

 

May God Bless you
Article by: Mr. Jayesh Dave
Date Write: 11 June, 2012