Neptune is the eighth and farthest planet from the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth, and slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. Being composed primarily of gases and liquids, it has no well-defined solid surface. The planet orbits the Sun once every 164.8 years at an orbital distance of 30.1 astronomical units (4.5 billion kilometres; 2.8 billion miles). It is named after the Roman god of the sea and has the astronomical symbol ♆, representing Neptune's trident.
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original video :-    • Holst The Planets with Professor Bria...  
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Brian Edward Cox is an English physicist and former musician who is a professor of particle physics in the School of Physics and Astronomy at the University of Manchester[2][3] and The Royal Society Professor for Public Engagement in Science.[4] He is best known to the public as the presenter of science programmes, especially BBC Radio 4’s The Infinite Monkey Cage and the Wonders of... series[5][6] and for popular science books, such as Why Does E=mc²? and The Quantum Universe.
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