Venus | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-03

This is an audio version of the Wikipedia Article:
Venus


00:03:00 1 Physical characteristics
00:03:54 1.1 Geography
00:06:58 1.2 Surface geology
00:10:49 1.3 Internal structure
00:11:54 1.4 Atmosphere and climate
00:18:08 1.5 Magnetic field and core
00:20:43 2 Orbit and rotation
00:25:01 3 Observation
00:26:26 3.1 Phases
00:27:18 3.2 Transits
00:28:53 3.3 Pentagram of Venus
00:29:33 3.4 Daylight apparitions
00:30:23 3.5 Ashen light
00:31:02 4 Studies
00:31:11 4.1 Early studies
00:35:11 4.2 Ground-based research
00:36:53 4.3 Exploration
00:40:08 5 In culture
00:41:37 5.1 Modern fiction
00:43:29 5.2 Symbol
00:44:34 6 Habitability
00:45:04 7 See also
00:46:19 8 Notes



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SUMMARY
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Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period (243 days) of any planet in the Solar System and rotates in the opposite direction to most other planets (meaning the Sun would rise in the west and set in the east). It does not have any natural satellites. It is named after the Roman goddess of love and beauty. It is the second-brightest natural object in the night sky after the Moon, reaching an apparent magnitude of −4.6 – bright enough to cast shadows at night and, rarely, visible to the naked eye in broad daylight. Orbiting within Earth's orbit, Venus is an inferior planet and never appears to venture far from the Sun; its maximum angular distance from the Sun (elongation) is 47.8°.
Venus is a terrestrial planet and is sometimes called Earth's "sister planet" because of their similar size, mass, proximity to the Sun, and bulk composition. It is radically 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, or roughly the pressure found 900 m (3,000 ft) underwater on Earth. Venus is by far the hottest planet in the Solar System, with a mean surface temperature of 735 K (462 °C; 863 °F), even though Mercury is closer to the Sun. 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. It may have had water oceans in the past, but these would have vaporized as the temperature rose due to a runaway greenhouse effect. The water has probably photodissociated, and the free hydrogen has been swept into interplanetary space by the solar wind because of the lack of a planetary magnetic field. Venus's surface is a dry desertscape interspersed with slab-like rocks and is periodically resurfaced by volcanism.
As one of the brightest objects in the sky, Venus has been a major fixture in human culture for as long as records have existed. It has been made sacred to gods of many cultures, and has been a prime inspiration for writers and poets as the morning star and evening star. Venus was the first planet to have its motions plotted across the sky, as early as the second millennium BC.As the closest planet to Earth, Venus has been a prime target for early interplanetary exploration. It was the first planet beyond Earth visited by a spacecraft (Mariner 2 in 1962), and the first to be successfully landed on (by Venera 7 in 1970). Venus's thick clouds render observation of its surface impossible in visible light, and the first detailed maps did not emerge until the arrival of the Magellan orbiter in 1991. Plans have been proposed for rovers or more complex missions, but they are hindered by Venus's hostile surface conditions.