Red+Giants+and+Nebulas


==A red giant is simply a star that is in its last stages of its 5 billion year old life. As the star is heading towards the end of its life, when it is losing its protons, the nuclei of hydrogen atoms. The core is left with alphas, the nuclei of helium atoms. The star begins to cool down and shrink to a smaller size. The outer layers of the star begin to fall inwards because of the force of gravity, these layers heat up while falling inwards. The temperature of the core’s shell begins to heat up and this causes the star to expand to a very large size because of a fusion which turns protons into alphas. Now, the cores temperature is extremely hot, a lot hotter than it was just a regular star. The outer layers of the star begin to swell and expand; the star becomes a red giant. By the time the fusion has finished, the radiation has turned weak by the time its has reached the surface. This weak radiation gives the star its bright red appearance. In the core, fusions are happening which realises a bit more energy for the red giant to keep star burning for a bit longer. ==


==A nebula is a large interstellar cloud full of dust, hydrogen gas and plasma in space. It is also the first stage of a star’s life. They are created from both the destruction and the formation of a star. Nebulas may be formed from the formation of a star. Nebulas form from the gravitational collapse of diffuse gas. The material collapses under its own pressure, this may form stars in the centre. Sizes and number of stars may vary. Nebulas may be formed from supernova explosions, material thrown from the explosion is ionised by the supernova remnants. There are four main types of nebulas: Planetary nebulas, Reflection nebulas, Emission nebulas, and Absorption nebulas. ==