Planet Definition–noun | 1. | Astronomy. | a. | Also called major planet. any of the nine large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, or Pluto in the order of their proximity to the sun. | | b. | a similar body revolving about a star other than the sun. | | c. | (formerly) a celestial body moving in the sky, as distinguished from a fixed star, applied also to the sun and moon. | | | 2. | Astrology. the sun, moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, or Pluto: considered sources of energy or
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consciousness in the interpretation of horoscopes. | |
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Mars Definition–noun | 1. | the ancient Roman god of war and agriculture, identified with the Greek god Ares. | | 2. | Astronomy. the planet fourth in order from the sun, having a diameter of 4222 miles (6794 km), a mean distance from the sun of 141.6 million miles (227.9 million km), a period of revolution of 686.95 days, and two moons. | –adjective | 3. | (often lowercase ) of or pertaining to any of various pigments used in painting that are artificially made from an iron oxide base: Mars color; Mars pigments. | |
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Related topics from BritannicaMars
fourth planet in the solar system in order of distance from the Sun and seventh in size and mass. It is a conspicuous, sometimes quite bright, reddish object in the night sky. Mars is designated by ...
planet
(from Greek planetes, "wanderers"), broadly, any relatively large natural body that revolves in an orbit around the Sun or around some other star and that is not radiating energy from internal ...
Mars Global Surveyor
robotic U.S. spacecraft launched to the planet Mars to carry out long-term study from orbit of the entire surface, the atmosphere, and aspects of the interior. High-resolution images returned from ...
Mars Pathfinder
robotic U.S. spacecraft launched to Mars to demonstrate a new way to land a spacecraft on the planet's surface and the operation of an independent robotic rover. Developed by NASA as part of a ...
Mars, canals of
apparent systems of long, straight linear markings on the surface of Mars that are now known to be illusions caused by the chance alignment of craters and other natural surface features seen in ...
Mars Exploration Rover
either of a pair of U.S. robotic vehicles that explored the surface of Mars beginning in January 2004. The mission of each rover was to study the chemical and physical composition of the surface at ...
The Mystique of Mars
On Aug. 27, 2003, thousands of people lined up at telescopes to glimpse Mars during its closest approach to Earth in more than 60,000 years (at a distance of 56 million km [35 million mi]). Even ...
Astronomers Reclassify Pluto as a Dwarf Planet
"What's in a name? That which we call a rose by any other word would smell as sweet." These lines, spoken about Romeo by Shakespeare's Juliet, encapsulated the debate that peaked in 2006 over the ...
asteroid
any of a host of rocky small bodies, about 1,000 km (600 miles) or less in diameter, that orbit the Sun primarily between the orbits of Mars and Jupiter in a nearly flat ring called the asteroid ...
Mars
The first known map of Mars was produced in 1830 by Wilhelm Beer and Johann Heinrich von Madler of Germany. The Italian astronomer Giovanni Virginio Schiaparelli prepared the first modern ...
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