Explanation Writing

Aurora Australis

Have you ever witnessed nature's light show dancing across the night sky. This colourful display is referred to, and known as “The Southern Lights”. What causes this spectacular illumination, Aurora Australis?

The Aurora Australis is triggered first by the sun. The sun is always active, solar flares are common. When a solar flare happens the solar flare ejects a cloud of ions, electrons and atoms into space. The particles fly out into space and travel thousands  of kilometres across the solar system.

   Diagram of the Aurora Australis.                                                             

The particles arrive at Earth’s magnetic field. This magnetic field  is invisible and it acts as a shield that doesn't let any particles in or out. Instead it guides them along the shape of the magnetic field to the North and South pole.

While the particles are in the magnetic field, they accelerate to speeds of up to 100 kilometre an hour. As they reach the North or South pole the particles collide with other particles in Earth’s atmosphere releasing energy in the form of light.

The Aurora Australis is a wonderful display caused by solar flare’s. Auroras can happen on other planets not just Earth, they all happen the same.  

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How Was The Solar System Formed

Have you ever wondered how the Solar System right before you was created? For years people have wondered how the Solar System was formed to be how it is today. The story of the creation of the Solar System is long and has catastrophic events that lead up to create our existence.      

The whole of our existence is caused by an ancient Star exploding, littering space with swirling clouds called Nebulae. A Nebulae are the materials the Sun has made in its life, the lighter materials are from  when it lived and the metals are from when it died. The Nebulae flies out into space which starts the process of a solar system forming.

The outer rim of the Nebulae starts collapsing on its own gravity. As the Nebulae collapses on its gravity it starts to spin faster and faster with the Nebulae getting smaller and more compact. The speed is so fast that the centre heats up dramatically creating the sun, the rest of the materials spread out into a vast disc of dust around the sun.

Luckily our Nebulae had materials for life. The materials start colliding with each other there can be two outcomes. One of the outcomes is both of the materials stick together or they bump into each other and start the process again. The materials keep colliding and get bigger and bigger. It starts becoming survival of the fittest. Soon massive balls of materials are big enough for planets. Or for the next event…

By then the Sun has got hot enough for the final stage. The sun's most dramatic event happens. A massive life threatening solar flare blasts the too small materials out into space also that's the cause of asteroids in space. The only things that survived were the Moons, Planets and Dwarf Planets.

The creation of the Solar System is astonishing it starts with a star exploding and releasing Nebulas into space. Then collapsing on its own gravity to start progress. After 4.6 Billion years the Solar System was formed. All Nebulas are different that's why all Solar Systems are different.

By Alex

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