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The Sun is the only star in the Solar System. The biggest and brightest of all the stars we see in the sky because it is the closest to Earth. It is a medium-sized star, which is in the middle of its stable viewing time. It has illuminated the Solar System for around five million years. It is a huge sphere of Hydrogen and Helium that produces energy and radiates it into space. The mass of the Sun is much greater than that of all other bodies in the Solar System: it corresponds to approximately 99.8% of the mass of the Solar System. It moves together with all the bodies that surround it, around the central region of the Milky Way: we say it has translational movement. As it also rotates on itself, we say that it has a rotational movement. Due to its constitution, which is not uniform, becoming less and less dense towards the surface, it has no defined limits and does not all rotate at the same speed.
