Meteor the term meteor is used to refer to a particle

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Meteor – The term meteor is used to refer to a particle of debris (space dust) which hasentered the atmosphere of a planet or satellite. It also refers to the visible path left by suchan object.Meteoroid – A meteoroid is a particle of rocky or metallic debris found in space. If a meteoroidenters the Earth’s atmosphere it becomes a meteor, and upon landing any surviving remnantis called a meteorite.Million – Ten raised to the sixth power, or 1,000,000.Network valley – A network valley is one of a set of branching valleys found on Mars, witha resemblance to terrestrial river drainage basins. They are usually less than five kilometerswide, though they may extend for thousands of kilometers in length.Noachian Period – The first of three major periods in Martian history, dating from formationepoch 4.5 billion years ago to 3.5 billion years ago. This era is named for Noachis Terra, alarge southern hemisphere highland. Surfaces dating back to the Noachian are covered withmany craters, and exhibit the largest impact craters, but widespread evidence for watererosion suggests that the planetary surface was warm and wet during this time. They arefound predominantly in the southern hemisphere.Outflow channel – An outflow channel is a particular type of surface feature found on Mars.Outflow channels are wide and long, and contain streamlined remnants of ancient featureswhich have been sculpted by the passage of fluids (such as lava or water flows). They canextend over hundreds of kilometers in length, and can be up to a few hundred kilometerswide as well. Kasei Vallis is a prominent example of such.Plate tectonics – Plate tectonics defines a theory of planetary surface dynamics in which aplanet’s outer skin (the lithosphere) is broken into plates. These plates are driven by internalheat, and shift and interact in various ways (including collisions).Proto-planetoid – This word is a combination of “proto”, meaning first or earliest, and“planetoid,” meaning minor planet. The proto-planetoids in the early solar system were thelargest of the building blocks which combined (through collisions) to form the major planetswhich we know, and love, today.Rille – The word rille (also rill) is used to denote long trenches, or brooks or streams, andwas often used in describing lunar features seen through the first telescopes.River delta – A river delta is land formed from sediment (silt) that builds up at the mouth6
of a river, where it flows into an ocean or other large body of water.Scablands – Scablands are erosive features, composed of flat, elevated land characterizedby poor soil and little or no vegetation, marked by dry channels which formed through theaction of glaciers. The Channeled Scablands of the state of Washington were created by theMissoula Floods during the Pleistocene era, and are the most well-known of such features.

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