Essay about Solar System
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Humans live on a small planet in a tiny part of a vast universe. This part of the universe is called the solar system, and is dominated by a single brilliant star-the sun. The solar system is the earth’s neighbourhood and the planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto are the Earth’s neighbours. They all have the same stars in the sky and orbit the same sun.
Scientists believe the solar system began about 5 billion years ago, perhaps when a nearby star exploded and caused a large cloud of dust and gas to collapse in on itself. The hot, central part of the cloud became the sun, while some smaller pieces formed around it and became the planets. Other fragments became asteroids and comets,…show more content…
Future manned expeditions could melt the ice into water, for drinking, washing and turning into rocket-fuel: there is enough ice to make a lake 10km across and 10m deep.
If you approached the Solar System from space, one planet would stand out as very odd. The third world from the sun is brightly coloured, in shades of mainly blue, with patches of red and green, and constantly shifting patterns of white cloud. And it has an unusually large moon; which-by contrast- is dull and uniformly brown.
The perfect planet
Come closer, and you find blue is liquid water. This is the only rocky planet with water. Test the atmosphere, and again this planet is unique: the air contains a lot of reactive gas oxygen. And finally, take a closer look at the green areas. Here there is ample vegetation and animal life. This is the only planet in the solar system obviously inhabited life forms.
The earth is special mainly because it is located at the perfect distance from the sun. The temperature here is just right for water to exist as a liquid: get in as close Venus and the water just boils away as steam, while as far out as the orbit of Mars water is frozen to ice.
Soon after the birth of earth, it was a very different place from the one we know today.
Its “air” was made of the unbreathable and
The Pyramids of the Sun and the Moon, echoing the shape of the mountains surrounding the valley, served as focal points for Teotihuacan’s urban layout. Beneath the pyramids are earlier structures; perhaps even tombs of Teotihuacan rulers are to be found within their stone walls. When the Pyramid of the Sun was completed circa 200 A.D., it was some 63 meters tall and 215 meters square. One of the largest structures ever built in the ancient Americas, its aspect today is the result of reconstruction and consolidation carried out in the early part of the twentieth century. Excavations in 1971 directly under the Pyramid of the Sun revealed a tunnel-like cave, ending in a cloverleaf-shaped set of chambers, apparently the scene of numerous ancient fire and water rituals. This cave may have been a “place of emergence”—the “womb” from which the first humans came into the world in central Mexican thought. Caves are a key part of symbolic imagery associated with creation myths and the underworld throughout Mesoamerican history. The location and orientation of this cave may have been the impetus for the Pyramid of the Sun’s alignment and construction.
The Pyramid of the Moon, at the northern end of the Street of the Dead, was probably completed around 250 A.D. Recent excavations near the base of the pyramid staircase have uncovered the tomb of a male skeleton with numerous grave goods of obsidian and greenstone, as well as sacrificial animals. One of the most significant tombs yet discovered at Teotihuacan, it might indicate that even more important tombs lie buried at the heart of the pyramid.
Department of the Arts of Africa, Oceania, and the Americas, The Metropolitan Museum of Art