TRIBUN-MEDAN.com – School textbooks are about explaining what makes Pluto no longer a planet.
Pluto which was once known as the smallest and farthest planet, is no longer considered a planet
Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer.
Since then Pluto has been called the ninth planet in the world solar system we. Previously there were the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
No more planets
But in 2006 Pluto’s status was no longer called a planet. This is the result of the general meeting of the International Astronomy Union (IAU).
Reporting from Live Science, to become a planet, a celestial body must meet three criteria. Those criteria are:
- Planets must orbit the sun.
- The planet must clear its environment from orbit and this gravitationally sweeps and clears the surrounding space of other objects.
- Planets must be round.
But Pluto does not meet all three criteria. Pluto only follows two criteria, namely being round and orbiting the sun.
Pluto is surrounded by thousands of other celestial bodies and chunks of debris. It has not cleared the environment around its orbit.
Reporting from Kompas.com (21/1/2016), astronomers found clues to the existence of the ninth planet. The planet is not Pluto which has been removed from its position as a planet.
This discovery has the potential to shake up the understanding of the solar system again. Michael E Brown and Konstantin Batygin of the California Institute of Technology revealed research indicating the existence of the ninth planet in a publication in the Astrophysical Journal on Wednesday (20/1/2016).
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