17th anniversary of ‘Pluto’ being reduced to mere status. ‘Dwarf planets’ become former planets in the solar system Because the International Astronomical Union redefined the term “planet” and Pluto’s status did not question the third definition of a planet.
Do you know Pluto?
Percival Lowell, American astronomer noted that the movement of Neptune and Uranus disturbed by other planets which he assumed might be a large planet He searched for the planet for 11 years, finding nothing until his death in 1916.
Later in the year 2472 Lowell Observatory. Founded by Percival Lowell, Clyde Tombaugh began his search for a mysterious planet again. It took Clyde Tombaugh a little over a year with a 33-centimeter telescope and a blinking calibrator. Until the discovery of a new planet on February 18, 1929, and the discovery of the ninth planet of the solar system was announced on March 13, 1929.
May 1, 1930 announced the use of the name “Pluto” as the official name.
“Pluto” was proposed by “Venetia Bernay”, an Oxford girl. Pluto is the name of the invisible Roman god of the underworld. Another good reason this name was chosen is that The first two letters of Pluto’s name, P-L, correspond to the initials of Lowell’s first and last name. thus honoring this important astronomer as well
Pluto’s mass is only 0.07 times the mass of other objects in its region. The atmosphere is more than 300 km thick, while Earth’s atmosphere is only 40 km thick. Pluto’s rotation is 120 degrees, while Earth’s axis is tilted 23.5 degrees.
That means Pluto spins in the opposite direction to its orbit in the Solar System, and only Pluto and Uranus rotate sideways like this. And the fact that Pluto’s axis is tilted so much This is one piece of evidence that supports the theory that Pluto has been hit by a massive impact before.
In 2006, the International Astronomical Union (IAU) established a definition of “planet” in Prague. There are three main points for an object to be called a planet:
Planets in the solar system are celestial bodies where:
1. The object must orbit the Sun2. The object must have enough mass to maintain its spherical shape by its own gravity. especially The object’s gravity should keep it in hydrostatic equilibrium.3. The object must not have any other objects in its vicinity.
For this reason, “Pluto” does not meet the third definition. Because it has a mass of only 0.07 times the mass of other bodies in the same region, which is very small compared to other stars in the solar system. And from the results of the vote on Thursday, August 24, 2006, “Pluto” was removed from being a planet. It is classified as a dwarf planet.
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