write a essay on mercury 500 words
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Like Venus, Mercury orbits the Sun within Earth's orbit as an inferior planet, and never exceeds 28° away from the Sun when viewed from Earth. This proximity to the Sun means the planet can only be seen near the western or eastern horizon during the early evening or early morning. At this time it may appear as a bright star-like object, but is often far more difficult to observe than Venus. The planet telescopically displays the complete range of phases, similar to Venus and the Moon, as it moves in its inner orbit relative to Earth, which reoccurs over the so-called synodic period approximately every 116 days.
Mercury is tidally locked with the Sun in a 3:2 spin-orbit resonance, and rotates in a way that is unique in the Solar System. As seen relative to the fixed stars, it rotates on its axis exactly three times for every two revolutions it makes around the Sun. As seen from the Sun, in a frame of reference that rotates with the orbital motion, it appears to rotate only once every two Mercurian years. An observer on Mercury would therefore see only one day every two Mercurian years.
Mercury's axis has the smallest tilt of any of the Solar System's planets (about 1⁄30 degree). Its orbital eccentricity is the largest of all known planets in the Solar System; at perihelion, Mercury's distance from the Sun is only about two-thirds (or 66%) of its distance at aphelion. Mercury's surface appears heavily cratered and is similar in appearance to the Moon's, indicating that it has been geologically inactive for billions of years. Having almost no atmosphere to retain heat, it has surface temperatures that vary diurnally more than on any other planet in the Solar System, ranging from 100 K (−173 °C; −280 °F) at night to 700 K (427 °C; 800 °F) during the day across the equatorial regions. The polar regions are constantly below 180 K (−93 °C; −136 °F). The planet has no known natural satellites.
Two spacecraft have visited Mercury: Mariner 10 flew by in 1974 and 1975; and MESSENGER, launched in 2004, orbited Mercury over 4,000 times in four years before exhausting its fuel and crashing into the planet's surface on April 30, 2015. The BepiColombo spacecraft is planned to arrive at Mercury in 2025.
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Planet Mercury Essay
Essay Topic: Earth, Planet
Our solar system consists of the sun and nine planets. Mercury is the closest planet to the sun. Mercury was named after the Roman God of Commerce and Thievery. It might have gotten its name because of the way it quickly appears and disappears from Earth’s view.
Mercury is the second smallest planet in the solar system; Pluto is the only planet that is smaller. Earth’s diameter is about 7,200, while tiny Mercury has less than half of that size, about 3,000 miles in diameter.
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Mercury, a planet, is smaller than Ganymede, a satellite revolving around Jupiter.
One of the features of Mercury distinguishing it from other planets is that it has a different orbit loop. Whereas the orbit of most planets has the shape of a circle, the Mercury’s orbit has the shape of ellipse that looks like a stretched out circle. For that reason, the distance from Mercury to the sun varies from about 27 to 41 million miles. Mercury races around the sun faster than any other planet. A Mercurial year accounts only for 88 days, while our year on Earth comprises 365 days that is four times longer than of the Mercurial. We all know that it takes 24 hours or one day for Earth to make one complete rotation around its axis. For Mercury to make the same complete rotation, it will take as many as 59 Earth days!
Mercury for the most part is a rocky planet along with Earth and Venus. Mercury is made mostly of iron, with a thin rocky layer on it surface. If you look at the model of Mercury, you will see many craters on its surface. The planet has been hit many times throughout its existence by asteroids and other flying objects. Those impacts resulted in a plenty of craters covering its surface. It is believed that likewise craters had covered all Earth at one time in the past. However, due to the erosion of soils, extremely changeable weather, and climate conditions, those craters had been leveled off.
Mercury has some interesting characteristics that make it unique. It is the closest planet to the sun, has ellipse orbit, resolves around the sun faster than any other planet, rotates very slowly, has the greatest temperature change, and almost no air. Also, those facts prove that life is impossible on Mercury.