Betelgeuse, or Betelgeux is a large red supergiant star in the constellation Orion. It is one of the largest and most light giving stars we can see. Its name means "the Warrior's Armpit". Betelgeuse is visible to the naked eye as a small, bright circle on winter nights in the northern hemisphere and in summer in the southern hemisphere. Because the of the Earth's orbit, the view of the constellations and the stars is varied. Betelgeuse lies around 640 light-years from Earth.
Betelgeuse is a variable star. It loses and gains brightness over a certain period of time. This is because Betelgeuse sometimes grows bigger or smaller, causing a change in brightness. Its magnitude changes between 0.2 and 1.2. Betelgeuse is also very heavy and it has a diameter that is 1180 times the Sun's diameter. When it runs out of energy, it will explode as a supernova.
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