90 years since the discovery of Pluto … the smallest planet in the solar system


Planet Pluto is the smallest planet in the nine planets of the solar system, and from the severity of its smallness, many astronomers do not consider it from the planets, but some have tried to consider it a follower of Neptune, as it is the only planet that a spacecraft has not visited yet, and on this day January 21 of 1930 Scientists discover Pluto.

For the smaller planet, the International Astronomical Union considered Pluto a dwarf planet and redefined the term “planet” on August 24, 2006, bringing the number of the solar system’s planets to eight.

Its average temperature is -234 ° C, the object consists of methano nitrogen, the average distance between it and the sun is approximately 5914.18 million km, and the closest distance from it to Earth is 28.8 astronomical units, the average orbital speed is 5.4 km / second, and the planet revolves around itself 18 hours 26 minutes

The NASA had launched the New Horizons, Florida, probe, carrying a giant rocket to Pluto in 2006. The missile was equipped with five additional solid fuel engines and is moving at a speed of 75600 km per hour. The probe is expected to reach Pluto after ten years to take the first pictures For Pluto, it will also measure UV emissions from Pluto’s atmosphere.

Pluto revolves around the sun, an anomalous oval range that is not fixed, and is far from the circle of the Sun’s path. The reason why the planets rotate around the sun counterclockwise is caused by the sun’s rotation around itself, producing the rest of the planets moving in the same direction of rotation by the gravity in them.


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