Mercury / Mercurio

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Mercury is the planet of the solar system closest to the Sun and the smallest with the exception of the dwarf planets. It is one of the rocky planets and has no satellites. Has a lighter atmosphere consisting of potassium, sodium and other elements. The pressure of the atmosphere is a hundred thousandth of the atmospheric pressure on the surface of the earth. Perhaps because of being a small planet its gravity is insufficient to hold for long periods of time major atmospheric density. Mercury has an orbital period of about 88 Earth days. Because Mercury's orbit lies within Earth's orbit, it can appear in Earth's sky in the morning or the evening, but never in the middle of the night.


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Mercurio es el planeta del Sistema Solar más próximo al Sol y el más pequeño a excepción de los planetas enanos. Es uno de los planetas rocosos y no tiene satélites. Tiene una liviana atmósfera constituida por potasio, sodio y otros elementos. La presión de la atmósfera es una cienmilésima parte de la presión atmosférica en la superficie de la Tierra, quizá porque al ser un planeta pequeño su gravedad es insuficiente para retener durante largos periodos de tiempo una densidad atmosférica importante. Mercurio tarda en dar una vuelta completa al sol, 88 días terrestres. Debido a que la órbita de Mercurio se encuentra dentro de la órbita de la Tierra, puede observarse desde la Tierra solo por la mañana o el vespertino (entrelubricán), pero nunca en mitad de la noche.

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