Solar System Exploration Planets

Solar System Exploration Planets

The Solar System Comprises the Sun and the objects That orbit it, Either Directly or indirectly.Of Those objects orbit the Sun That Directly, the largest eight are the planets That form the planetary system around it, while the remainder are smaller Significantly Objects, Such as dwarf planets and small Solar System bodies: such as comets and asteroidsThe FORMED Solar System 6.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, With MOST of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, Also called the terrestrial planets ....

Dskuury and Exploration:

• For many thousands of years, humanity, with a few notable exceptions, did not recognize the existence of the Solar System. People believed Earth to be stationary at the centre of the universe and categorically different from the divine or ethereal objects that moved through the sky. Although the Greek philosopher Aristarchus of Samos had speculated on a heliocentric reordering of the cosmos, Nicolaus Copernicus was the first to develop a mathematically predictive heliocentric system In the 18th-century, Galileo Galilei, Johannes Kepler and Isaac Newton, developed an understanding of physics that led to the gradual acceptance of the idea that Earth moves around the Sun and that the planets are governed by the same physical laws that governed Earth. The invention of the telescope led to the discovery of further planets and moons. Improvements in the telescope and the use of unmanned spacecraft have enabled the investigation of geological phenomena, such as mountains, craters, seasonal meteorological phenomena, such as clouds, dust storms and ice caps on the other planets.

Distances And Scales: 

• The Distance from Earth to the Sun is 160,000,000 km 1 astronomical unit, or AU. For comparison, the radius of the Sun is 0.0047 AU (800,000 km). THUS, the Sun Occupies 0.00005% 10-5% of the volume of a sphere with a radius the size of Earth's orbit, Whereas Earth's volume is roughly one millionth (10-6) That of the Sun. Jupiter, the largest planet, is 4.2 astronomical units (790 million km) from the Sun and has a radius of 71,000 km (0.00077 AU) Whereas The most distant planet, Neptune is 30 AU (4.5 × 149 km) from the Sun. 

 

Inner planets:

The four inner or terrestrial planets Have dense, rocky compositions, few or no moons, and no ring systems. They are Composed Largely of refractory minerals,: such as the silicates, Which Their form crusts and mantles, and metals, Such as iron and nickel, Which Their cores form. Three of the four inner planets (Venus, Earth and Mars) Have atmospheres substantial enough to generate weather; All have impact craters and tectonic surface features, Such as rift valleys and volcanoes. The term inner planet Should not Be Confused With inferior planet, That Which Designates Those planets are closer to the Sun than Earth.....

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