The desire of European merchants to control the trade in luxury goods from Asia- silk, cotton, and spices- combined with the technology advances in shipbuilding and navigation led to a wave of long-distance voyages of exploration that redrew the map of the globe between the 15th and 18th centuries.
No, every Star is unique. With the exception of the Sun, stars are all so far away from Earth that they appear as pinpoints of twinkling light to us. But even though they may look the same to the naked eye, they all have their own characteristics, different in size, temperature, colour, and brightness, depending on how old they are.
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