What is a Planet ?
Channel: The Basics Stuffs
Date: 20/03/2021

#Planet #solarsystem #Space #NASA

What is a Planet?
A planet is a celestial body that orbits the sun, is spherical in shape, and has sufficient mass to assume hydrostatic equilibrium (a nearly round shape). In our solar system, there are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These eight planets are divided into two categories: inner planets and outer planets. The inner planets (Mercury, Venus, Earth, and Mars) are smaller, rockier planets that are located closer to the sun. The outer planets (Jupiter, Saturn, Uranus, and Neptune) are larger, gas giants that are located farther from the sun.

In 2006, the International Astronomical Union (IAU) adopted a new definition of a planet, which states that a planet is a celestial body that orbits the sun, is spherical in shape, and has cleared its orbit of other objects. This definition led to the reclassification of Pluto as a "dwarf planet," because it shares its orbit with other objects in the Kuiper Belt, a region of small, icy bodies beyond Neptune.

To be classified as a planet, an object must meet certain criteria, including:
1. It must orbit around a star.
2. It must be massive enough to be round due to its own gravity. This means it must have enough mass to overcome the force of its own materials attempting to fly apart, resulting in a roughly spherical shape.
3. It must have cleared its orbit, meaning it must be the dominant object in its orbit and not share its orbit with other objects of similar size.

What is a Planet?  https://fuzzytimes.com/what-is-a-planet/1126/

"Grah" ek celestial body hai jo ek star ke saath orbit karta hai aur kisi dusre grah ki satellite nahi hai. Ye rock ya gas se bana hota hai aur apni gravity ke kaaran nearly round shape maintain karne ke liye sufficient mass rakhta hai. Grahon ke aksar asteroids aur comets se bada hota hai aur ek star ke saath clear aur distinct orbit rakhta hai.

Hamare solar system mein 8 grahon hain: Merkuri, Venus, Earth, Mars, Jupiter, Saturn, Uranus, aur Neptune. Ye sab grahon alag-alag hain aur apne apne charachteristics aur features hain.

8 grahon ke alawa, dwarf grahon bhi hain, jo grahon ke bahut saare tarah se similar hote hain magar full-fledged grah banne ke liye sabhi criteria poori nahi karte. Pluto ek dwarf grah ka ek udaaharan hai, jiska pehle solar system mein 9th grah mana jaata tha magar bad mein uska size aur orbit ke kaaran dwarf grah ke taur par reclassified kiya gaya.


Credit: NASA
https://anchor.fm/thebasics/episodes/E1--What-is-a-Planet-eqpbip

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