who is earth"s sister and how, venus , mercury, sun, same size, same colour, earth donsent has a sister , which is the biggest planet on earth, jupiter, mars, venus, sartun, which is the coldest planet on space, neptune, uranus, mars, in which planet is the gigantic black spot, mars, mercury , venus, none, which is the hotest planet on space, venus, mars, earth, how is mars the redish planet, by dust, by wind , by its colour, by water.

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