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Venus vs. Sun - Comparison of sizes
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Venus vs Sun - Comparison

Venus
Sun
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Venus

Venus

Diameter (km)12104
Distance to sun (km)108200000
Equator (km)38025
Temperature437/497

Venus is the second planet from sunlight. It is named after the Roman goddess of love and beauty. As the thing in the night sky after the Moon, Venus may be, on occasion, visible to the naked eye in broad daylight and can cast shadows. Venus lies within Earth's orbit, and never appears to venture either setting in the west just after dusk or rising in the east a bit before sunrise. Venus orbits the Sun every 224.7 Earth days. Having a rotation period of 243 Earth days, it takes longer to rotate about its axis than any other planet in the Solar System and does so in the opposite direction to all but Uranus (meaning that the Sun rises in the west and sets in the east). Venus does not have any moons, a distinction it shares only with Mercury among planets in the Solar System.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 different from Earth in different respects. It's the atmosphere of the four planets, consisting of over 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 feet ) 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 reflective clouds of sulfuric acid, preventing its surface from being seen from space in light.



It might have had water oceans before, as the temperature rose because of a runaway greenhouse effect but these could have vaporized. The water has photodissociated, and the hydrogen that is free has been swept into space by the solar wind due to the lack of a planetary magnetic field. Venus's surface is a sterile desertscape interspersed with slab-like rocks and is periodically resurfaced by volcanism. Venus has been a significant fixture in human civilization for as long as records have existed. It has been made sacred to gods of many cultures, and has been a 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 planet with the nearest approach 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 also the first to be successfully landed on (by Venera 7 in 1970). The thick clouds of venus render observation of its surface impossible in visible light, and the detailed maps did not emerge before the Magellan orbiter's coming in 1991. Plans have been proposed for more complex missions or rovers, but the hostile surface conditions of Venus hinder them. In January 2020, astronomers reported evidence that suggests that Venus is volcanically active.

Source: Wikipedia
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Sun

Sun

Diameter (km)1392684
Equator (km)4370005
Temperature5778000

<p>The Sun is the star at the center of the Solar System. </p>It is a sphere of plasma, with inner convective movement that generates a magnetic field by means of a dynamo process. It is by far the main source of energy for life on Earth. Its diameter is about 1.39 million kilometers (864,000 miles), or 109 times that of Earth, and its mass is about 330,000 times that of Earth. It accounts for about 99.86% of the total mass of the Solar System. Roughly three quarters of the Sun's mass is composed of hydrogen (~73%); the remainder is mostly helium (~25%), with much smaller amounts of heavier elements, including oxygen, carbon, neon, and iron.The Sun is a G-type main-sequence celebrity (G2V) based on its spectral class. As such, it's informally rather than completely accurately referred to as a yellow dwarf (its light is closer to white than yellow). It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Whereas the remainder flattened into an orbiting disk that became the Solar System, most of this matter gathered in the center. The central mass became dense and so hot that it initiated nuclear fusion. It is believed that almost all stars form by this process.



The Sun fuses about 600 million tons of hydrogen into helium every second, converting 4 million tons of matter into energy every second. This energy, which may take 170,000 and between 10,000 years to escape from its core, is the origin of the Sun's light and heat. When hydrogen fusion in its core has diminished to the point where the Sun is no more in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature while its outer layers expand, eventually transforming the Sun into a red giant. It is calculated that the Sun will become sufficiently large to engulf the orbits of Venus and Mercury, and render Earth uninhabitable -- but not for about five billion years. After this, it will shed its outer layers and become a dense type of cooling star called a white dwarf, and no longer produce energy by fusion, but still glow and give off heat from its previous fusion. The Sun on Earth's effect has been recognized since ancient times, and some cultures as a deity have seen the Sun. Its orbit around the Sun and the synodic rotation of Earth will be the basis of solar calendars, among which is the calendar in use today.

Source: Wikipedia

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