MARS,THE FOURTH,PLANET,THE SUN,THE SOLAR SYSTEM,MERCURY,THE ROMAN,GOD OF WAR,THE RED,THE IRON,OXIDE,PREVALENT,SURFACE,REDDISH,APPEARANCE,TERRESTRIAL PLANET,THIN,ATMOSPHERE,FEATURES,REMINISCENT,IMPACT CRATER,THE MOON,THE VALLEYS,DESERTS,POLAR ICE CAPS,OF EARTH,PERIOD,SEASONAL,LIKEWISE,SIMILAR,TILT,THE SEASONS,THE SITE,OLYMPUS MONS,LARGEST,VOLCANO,HIGHEST,MOUNTAIN,VALLES MARINERIS,CANYONS,SMOOTH,BOREALIS BASIN,NORTHERN HEMISPHERE,COVERS,THE PLANET,GIANT IMPACT,FEATURE,TWO MOONS,PHOBOS AND DEIMOS,CAPTURED,ASTEROID,EUREKA,MARS TROJAN,MARS FLYBY,MARINER,SPECULATED,PRESENCE,LIQUID WATER,THE PLANETS,THIS WAS,VARIATIONS,IN LIGHT,DARK,PATCHES,PARTICULARLY,POLAR,LATITUDE,CONTINENTS,LONG DARK,INTERPRETED,IRRIGATION,CHANNELS,STRAIGHT LINE,EXPLAINED,OPTICAL ILLUSION,GEOLOGICAL,EVIDENCE,MISSIONS,SUGGESTS,ONCE,SCALE,WATER,COVERAGE,STAGE,EXISTENCE,RADAR,DATA,REVEALED,ICE,THE POLES,MID LATITUDES,MARS ROVER SPIRIT,CHEMICAL COMPOUNDS,WATER MOLECULES,PHOENIX LANDER,MARTIAN SOIL,NASA,ANNOUNCED,FLOWING,SALT WATER,THE MARTIAN SURFACE,HOST,SEVEN,SPACECRAFT,MARS ODYSSEY,MARS EXPRESS,MARS RECONNAISSANCE ORBITER,MAVEN,MARS ORBITER MISSION,MARS EXPLORATION ROVER,OPPORTUNITY,MARS SCIENCE LABORATORY,CURIOSITY,OBSERVATIONS,POSSIBLE,MONTHS,CURIOSITY ROVER,DISCOVERED,SOIL,ATTACHED,THUS,ACCESSIBLE,ONGOING,INVESTIGATIONS,THE PAST,POTENTIAL,THE POSSIBILITY,EXTANT,IN SITU,PERFORMED,VIKING LANDERS,SPIRIT AND OPPORTUNITY,ROVERS,FUTURE,ASTROBIOLOGY,PLANNED,EXOMARS,SEEN,EARTH,WITH THE NAKED EYE,COLORING,APPARENT MAGNITUDE,BY JUPITER,VENUS,THE MOON AND THE SUN,OPTICAL,GROUND,TELESCOPES,LIMITED,EARTHS ATMOSPHERE,HALF,DIAMETER,SURFACE AREA,LESS THAN,TOTAL,AREA,DRY LAND,LESS,DENSE,VOLUME,EARTHS MASS,EARTHS SURFACE,GRAVITY,ORANGE,CAUSED,IRON,RUST,LOOK LIKE,BUTTERSCOTCH,COMMON,COLORS,GOLDEN BROWN,GREENISH,MINERAL,PRESENT,CORE,MATERIALS,CURRENT,INTERIOR,REGION,IN RADIUS,NICKEL,SULFUR,SULFIDE,THOUGHT,TWICE,RICH,LIGHTER,ELEMENTS,EARTHS CORE,THE CORE,SILICATE,MANTLE,TECTONIC,VOLCANIC,APPEARS,BESIDES,SILICON,OXYGEN,MOST ABUNDANT ELEMENTS,THE MARTIAN,CRUST,MAGNESIUM,ALUMINUM,CALCIUM,POTASSIUM,AVERAGE,THICKNESS,MAXIMUM,EARTHS CRUST,AVERAGING,RATIO,TWO PLANETS,MINERALS,METAL,MAKE UP,ROCK,THE SURFACE,THOLEIITIC BASALT,PARTS,SILICA,BASALT,ANDESITIC,ROCKS,SILICA GLASS,REGIONS,ALBEDO,SHOW,CONCENTRATIONS,PLAGIOCLASE FELDSPAR,NORTHERN,DISPLAYING,HIGHER,NORMAL,SHEET,HIGH,GLASS,SOUTHERN HIGHLANDS,PYROXENES,HEMATITE,OLIVINE,DEEPLY,GRAINED,DUST,STRUCTURED,GLOBAL,MAGNETIC FIELD,POLARITY,DIPOLE,FIELD,PALEOMAGNETISM,MAGNETICALLY,SUSCEPTIBLE,PROPERTIES,BANDS,OCEAN,THEORY,PUBLISHED,RE EXAMINED,THE HELP,MARS GLOBAL SURVEYOR,PLATE TECTONICS,BILLION YEARS,PLANETARY,DYNAMO,CEASED,FUNCTION,AWAY,SOLAR SYSTEMS,FORMATION,STOCHASTIC PROCESS,RUN AWAY,ACCRETION,PROTOPLANETARY DISK,ORBITED,CHEMICAL,POSITION,BOILING POINTS,CHLORINE,PHOSPHORUS,SULPHUR,MUCH MORE,PROBABLY,AREAS,CLOSER,YOUNG,STARS,ENERGETIC,SOLAR WIND,THE FORMATION OF,SUBJECTED,LATE HEAVY BOMBARDMENT,SHOWS,RECORD,IMPACT,EVENTS,IMPACT BASIN,TIMES,THE MOONS,SOUTH POLE AITKEN BASIN,PLUTO,SIZED,BODY,THE EVENT,CAUSE,HEMISPHERIC,DICHOTOMY,THE GEOLOGICAL HISTORY OF,SPLIT,PERIODS,PRIMARY,NOACHIAN PERIOD,NOACHIS TERRA,NOACHIAN,SCARRED,IMPACT CRATERS,THARSIS BULGE,UPLAND,FLOODING,HESPERIAN PERIOD,HESPERIA PLANUM,THE HESPERIAN,MARKED,LAVA PLAINS,AMAZONIAN PERIOD,AMAZONIS PLANITIA,AMAZONIAN,METEORITE IMPACT,LAVA FLOWS,ELSEWHERE,ACTIVITY,TAKING,ATHABASCA VALLES,UP TO,FLOWS,GRABEN,CERBERUS FOSSAE,RECENT,IMAGES,AVALANCHE,CLIFF,SHOWING,ALKALINE,SODIUM,NUTRIENTS,GARDENS,NECESSARY,PLANTS,EXPERIMENTS,LANDER,SALT,PERCHLORATE,ONES,APPEAR,STEEP,SLOPES,VALLEYS,START,TINY,SPREAD,HUNDREDS,METRES,FOLLOW,EDGES,BOULDERS,PATH,ACCEPTED,THEORIES,UNDERLYING,LAYERS,AVALANCHES,BRIGHT,DUST DEVIL,FORWARD,INVOLVE,ORGANISMS,CANNOT,EXIST,ATMOSPHERIC PRESSURE,THINNER,EXCEPT,SHORT,THE VOLUME,IN THE SOUTH,POLAR ICE CAP,SUFFICIENT,COVER,ENTIRE,PLANETARY SURFACE,DEPTH,PERMAFROST,POLE,LATITUDES,TRAPPED,CRYOSPHERE,MIDDLE LATITUDES,LANDFORMS,VISIBLE,EXISTED,HUGE,LINEAR,OUTFLOW CHANNELS,CUT,RELEASE,AQUIFERS,STRUCTURES,HYPOTHESIZED,THE ACTION,GLACIERS,LAVA,MAADIM VALLIS,THE GRAND CANYON,WIDTH,RECENTLY,MILLION YEARS AGO,LANDSCAPE,RUNOFF,RAIN,SNOW,FALL IN,SUBSURFACE WATER,FLOW,GROUNDWATER SAPPING,PLAY,SUBSIDIARY,ROLES,PRECIPITATION,THE ROOT,ALMOST ALL,CASES,CRATER,CANYON,WALLS,THOUSANDS,GULLIES,BE IN,THE HIGHLANDS,SOUTHERN HEMISPHERE,FACE,THE EQUATOR,NUMBER,OF AUTHORS,PROCESS,MELTING,CARBON DIOXIDE,FROST,THE MOVEMENT,WEATHERING,SUPERIMPOSED,ACTIVE,GEOLOGICAL FEATURES,DELTAS,ALLUVIAL FANS,WETTER,CONDITIONS,INTERVAL,LAKE,PROPORTION,INDEPENDENT,MINERALOGICAL,SEDIMENTOLOGICAL,COMES,DETECTION,GOETHITE,SOMETIMES,DETECTED,JAROSITE,ACIDIC,FINDING,GYPSUM,MARS ROVER OPPORTUNITY,THE STUDY,LEADER,FRANCIS,PLANETARY SCIENTIST,THE UNIVERSITY OF NEW MEXICO,ALBUQUERQUE,LOOKING,CRYSTALLINE,AMOUNT,UPPER MANTLE,EQUAL TO,GREATER THAN,PARTS PER MILLION,ENOUGH,REPORTED,INSTRUMENTS,MINERAL HYDRATION,HYDRATED,CALCIUM SULFATE,BROKEN,FRAGMENTS,TINTINA,SUTTON,INLIER,VEINS,KNORR,ANALYSIS,INSTRUMENT,WATER