Essay Planet Mars

Essay Planet Mars-58
Earth and Mars are similar when it comes to their basic makeups, given that they are both terrestrial planets.This means that both are differentiated between a dense metallic core and an overlying mantle and crust composed of less dense materials (like silicate rock).

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But as human satellites and rovers began to conduct flybys and surveys of the planet, this vision of Mars quickly dissolved, replaced by one in which the Red Planet was a cold, desiccated and lifeless world.

However, over the past few decades, scientists have come to learn a great deal about the history of Mars that has altered this view as well.

At perihelion, when it is closest to the Sun, it orbits at a distance of approximately 206,700,000 km (1.3814 AU). Mars’s axial tilt is very similar to Earth’s, being inclined 25.19° to its orbital plane (whereas Earth’s axial tilt is just over 23°).

At these distances, the Earth has an orbital period of precisely 23h 56m and 4 s to complete a single sidereal rotation (0.997 Earth days), Mars does the same in about 24 hours and 40 minutes. This means that Mars also experiences seasons and temperature variations similar to that of Earth (see below).

When it comes to the surfaces of Earth and Mars, things once again become a case of contrasts.

Naturally, it is the differences that are most apparent when comparing Blue Earth to the Red Planet – as the nicknames would suggest.However, it’s mass is just 6.4185 x 10²³ kg, which is around 10.7% that of Earth’s. By comparison, Mars has a volume of 1.6318 x 10¹¹ km³ (163 billion cubic kilometers) which is the equivalent of 0.151 Earths.Between this difference in size, mass, and volume, Mars’s surface gravity is 3.711 m/s², which works out to 37.6% of Earths (0.376 At its greatest distance from the Sun (aphelion), Mars orbits at a distance of approximately 249,200,000 km (1.666 AU).Both the inner and outer cores are composed of iron and nickel, with trace amounts of lighter elements, and together, they add to a radius that is as large as Mars itself.Current models of Mars’ interior suggest that its core region is roughly 1,794 ± 65 kilometers (1,115 ± 40 mi) in radius, and is composed primarily of iron and nickel with about 16-17% sulfur.Scientists believe that these two satellites were once asteroids that were captured by the planet’s gravity.The low albedo and the carboncaceous chondrite composition of both moons – which is similar to asteroids – supports this theory, and Phobos’ unstable orbit would seem to suggest a recent capture.Ergo, the two planets are similar in composition, owing to their common status as terrestrial planets.And while they are both differentiated between a metallic core and layers of less dense material, there is some variance in terms of how proportionately thick their respective layers are.Unlike other planet’s in our Solar System, the vast majority of Earth is covered in liquid water, about 70% of the surface – or 361.132 million km² (139.43 million sq mi) to be exact.The surface of Mars is dry, dusty, and covered in dirt that is rich iron oxide (aka. However, large concentrations of ice water are known to exist within the polar ice caps – Planum Boreum and Planum Australe.


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