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paperback. Condición: New. Language:Chinese.Paperback. Pub Date: 2015-11-1 Pages: 137 Publisher: Beijing Daily Press (formerly concentric Press) Contents: the universe in the end how black holes are black stars do is a bottomless pit motionless yet the sun is a big ball of fire Why do Why Face moon will give the stars take the name of the Earth how old the Earth is like a big pear Why Why Why should the Earth day and night furious Why volcanoes '' angry Why the sea tide phenomenon Nevada is how long the sky out of the .…