Astronomy and Space Technology

The Universe

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The term “Universe” is the whole cosmic system of energy and matter of which the Earth, and therefore the human race, is also a part. The earliest systematic models of the Universe were developed by ancient Greek and Indian philosophers and were geocentric, placing the Earth at the Centre of the Universe. Over the periods, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the Centre of the Solar System. In emerging the law of universal gravitation, Sir Isaac Newton built upon Copernicus's work as well as observations by Tycho Brahe and Johannes Kepler's laws of planetary gesture.