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Venus

Venus Designations Pronunciation i/'vi?n?s/ Adjective Venusian or (rarely) Cytherean, Venerean Orbital characteristics Epoch J2000 Aphelion 108939000 km* 0.728213 AU Perihelion 107477000 km* 0.718440 AU Semi-major axis 108208000 km* 0.723327 AU Eccentricity 0.0067 Orbital period 224.701 d* 0.615198 yr* 1.92 Venus solar day Synodic period 583.92 days Average orbital speed 35.02 km/s Mean anomaly 50.115° Inclination 3.39458° to Ecliptic* 3.86° to Sun’s equator* 2.19° to Invariable plane Longitude of ascending node 76.678° Argument of perihelion 55.186° Satellites None Physical characteristics Mean radius 6051.8±1.0 km* 0.9499 Earths Flattening 0 Surface area 4.60×108 km2* 0.902 Earths Volume 9.28×1011 km3* 0.866 Earths Mass 4.8676×1024 kg* 0.815 Earths Mean density 5.243 g/cm3 Equatorial surface gravity 8.87 m/s2* 0.904 g Escape velocity 10.36 km/s Sidereal rotation period -243.0185 d (Retrograde) Equatorial rotation velocity 6.52 km/h (1.81 m/s) Axial tilt 177.36° North pole right ascension 18h 11m 2s* 272.76° North pole declination 67.16° Albedo 0.67 (geometric)* 0.90 (Bond) Surface temp. min mean max Kelvin 737 K Celsius 462 °C Apparent magnitude brightest -4.9 (crescent)* -3.8 (full) Angular diameter 9.7? to 66.0? Atmosphere Surface pressure 92 bar (9.2 MPa) Composition ˜?96.5% carbon dioxide* ˜?3.5% nitrogen* 0.015% sulfur dioxide* 0.007% argon* 0.002% water vapour* 0.0017% carbon monoxide* 0.0012% helium* 0.0007% neon* trace carbonyl sulfide* trace hydrogen chloride* trace hydrogen fluoride Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has no natural satellite. It is named after the Roman goddess of love and beauty. After the Moon, it is the brightest natural object in the night sky, reaching an apparent magnitude of -4.6, bright enough to cast shadows. Because Venus is an inferior planet from Earth, it never appears to venture far from the Sun: its elongation reaches a maximum of 47.8°. Venus reaches its maximum brightness shortly before sunrise or shortly after sunset, for which reason it has been referred to by ancient cultures as the Morning Star or Evening Star.Venus is a terrestrial planet and is sometimes called Earth's "sister planet" because of their similar size, gravity, and bulk composition (Venus is both the closest planet to Earth and the planet closest in size to Earth). However, it has also been shown to be very different from Earth in other respects. It has the densest atmosphere of the four terrestrial planets, consisting of more than 96% carbon dioxide. The atmospheric pressure at the planet's surface is 92 times that of Earth's. With a mean surface temperature of 735 K (462 °C; 863 °F), Venus is by far the hottest planet in the Solar System. It has no carbon cycle to lock carbon back into rocks and surface features, nor does it seem to have any organic life to absorb it in biomass. Venus is shrouded by an opaque layer of highly reflective clouds of sulfuric acid, preventing its surface from being seen from space in visible light. Venus may have possessed oceans in the past, but these would have vaporized as the temperature rose due to a runaway greenhouse effect. The water has most probably photodissociated, and, because of the lack of a planetary magnetic field, the free hydrogen has been swept into interplanetary space by the solar wind. Venus's surface is a dry desertscape interspersed with slab-like rocks and periodically refreshed by volcanism. Cite error: There are tags on this page, but the references will not show without a {{reflist}} template (see the help page).
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