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* The Universe is comprised of billions of galaxies each of which contains billions of stars and other celestial objects. The Sun provides energy to the Earth Planet in form of light. Earth is a very small part of the Universe, located in the Via Láctea.
Pictures and videos aproach us to the proposal adopted by the United Nations to raise awareness of the International Year of Light
* Scientific explanations, theories and models are those that best fit the facts known in time.