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Answer
The Rocket Technology
Explanation
Konstantin Tsiolkovsky was the Father of Modern Astronautics who in 1898 first proposed the idea of space exploration by rocket. In his first report he suggested the use of liquid propellants for rockets in order to attain a higher range. Early in the 20th century, Robert H. Goddard an American published a pamphlet attaining higher altitudes in rockets with a mathematical model called the meteorological sounding rocket.
The Achaemenid Empire (558–330 BC) of Persia, popularly referred to as the Persian empire, was a monarchy. It was ruled by a single hereditary leader, who considered himself divinely authorized to hold absolute power.
The Persian empire was a model of efficient ancient administration. The monarch appointed satraps as regional leaders, and delegated power in a way the preserved sufficient local autonomy to prevent most (non-Greek) subjects from wishing to revolt. It had an efficient system of roads and messengers, allowing rule over a large geographic area, and a regular system of taxation that established it on a sound financial footing. It also had a complex and uniform law code.
The demand for it is what makes it valuable
