Other celestial bodies have been observed from the earth for thousands of years. Ancient people knew that the planets they were seeing were somehow different from the other lights in the sky, though often attributed them to be gods or other otherworldly entities. It wasn’t until Copernicus published his book “On the Revolutions of Celestial Spheres” in 1543 that the idea of bodies orbiting around a central star, in this case the sun, that the idea of a ‘solar system’ was introduced. His findings were further validated by Galileo Galilei. Both men were cautious with their findings, for risk of persecution from the Catholic Church.
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