thehungergames The Big Bang is the term ud to describe a huge explosion that scientists believe happened around 15 billion years ago, creating our univer. Nobody knows what caud the Big Bang, since we cannot look back to a time before it. But just after the event, the univer is believed to have been a knot of tightly packed particles only about the size of a pea. Its temperature was ten thousand trillion, trillion degree Celsius.
The univer is made up of stars, planets, and other matter scattered throughout space.
A galaxy is a huge collection of stars held together by gravity. There are probably over a billion galaxies in the univer. They come in three basic shapes: spiral, elliptical, and irregular. The sun is just one of the common-sized stars contained within our home galaxy, the Milky Way.abag
拿粗挟细 The Milky Way is a large spiral galaxy(螺旋星系) measuring about 100,000 light-years across. It is about 14 billion years old and takes 225 million years or so to rotate once. Like all spirals, it contains plenty of gas and dust, from which new stars can form. The den nucleus is the oldest part and has no gas left for new stars.
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Our solar system is made up of the sun and the objects that orbit it. The include the eight planets (and probably more than eight) and their moons, as well as asteroids, comets, and meteors.
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Stars are large balls of hot gas that produce light and heat through nuclear reactions. Our Sun is an average yellow star, but ems bright becau it is so clo.
小学英语顺口溜 The Birth of a Star
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A star begins its life by condensing out of a cloud of dust and gas. When the star’s temperature is high enough, nuclear reactions begin and hydrogen converts to helium(氦)，creating a steady glow. Yellow stars, such as the sun, may shine steadily for billions of years before expanding and cooling into red giants. Finally they collap into small, den white dwarfs (矮子) and then die.
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The sun is the nearest star to the earth. It is a globe of hot gas, mostly hydrogen, and lies at the centre of our solar system. It contains no solid material.
subject to Planets are the largest objects that circle around the stars. They may be rocky, like the earth, or made mostly of gas and liquid, like Jupiter. The word planet is Greek for “wanderer”. The name comes from the way planets appear to move against the stars over time. It is thought that the planets formed at about the same time as the sun. As the original cloud of gas and dust collapd to form the sun, some matter was spun out into a flattened disk. Over veral million years, the dust and gas gathered together to form the planets and moons. Den rocks gathered near the sun and lighter gas farther out.
