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0 Is Pluto a planet? Read and write.
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Posted: September 25th
It used to be thought of as the ninth planet in our solar system. But then scientists had a
closer look at it, and decided that Pluto wasn't a planet. Planets must clear the region
around their (0) orbits_and Pluto doesn't do that. Although Pluto's gravity attracts
five (2)
that orbit around it, it is not strong enough either to attract or to
push away other (3)
in Pluto's path. Pluto is too small to be a planet, but it is
also too big to be an (4)
It is quite different, too. Pluto is now classified as
a (5)
It is a new name that is given to all space objects that are like Pluto
Scientists now believe that there could be as many as 200 of them in our (6)
DO
STA​

Answer 1

Respuesta:

pluto, designated (134340) Pluto, is a dwarf planet in the solar system located below Neptune's orbit. Its name is due to the Roman mythological god Pluto (Hades according to Greek mythology). A new category called plutoid was created at the General Assembly of the International Astronomical Union in Prague on August 24, 2006, which includes Pluto. It is also the prototype of a category of transneptunian objects called plutinos. Pluto has an eccentric orbit highly inclined with respect to the ecliptic, which runs closer in its perihelion to the interior of Neptune's orbit. It also has five satellites: Caronte, Nix, Hidra, Cerbero and Estigia, 3 4 which are celestial bodies that share the same category.

Its great distance from the Sun and Earth, together with its small size, prevents it from shining above magnitude 13.8 at its best moments (orbital perihelion and opposition), so it can only be seen with telescopes from the 200 mm aperture, photographically or with a CCD camera. Even at its best, it appears as a punctual star-like star, yellowish, without distinctive features (apparent diameter less than 0.1 arcseconds). It was not until 2015 when the New Horizons space probe passed over the planet and allowed its real appearance to be clearly appreciated for the first time.

Pluto was discovered on February 18, 1930 by the American astronomer Clyde William Tombaugh (1906-1997) from the Lowell Observatory in Flagstaff, Arizona, and was considered the ninth and smallest planet in the solar system by the International Astronomical Union and by the Public opinion from then until 2006, although its membership in the group of planets in the solar system was always the subject of controversy among astronomers. For many years there was a belief that Pluto was a Neptune satellite that had ceased to be a satellite due to reaching a second cosmic speed. However, this theory was rejected in the 1970s.5

After an intense debate, and with the proposal of the Uruguayan astronomers Julio Ángel Fernández and Gonzalo Tancredi before the General Assembly of the International Astronomical Union in Prague, Czech Republic, it was unanimously decided to reclassify Pluto as a dwarf planet, 6 requiring that a planet must have orbital dominance. Its classification as a planet was proposed in the draft resolution, but it disappeared from the final resolution, approved by the UAI General Assembly. Since September 7, 2006 it has the number 134340, granted by the Center for Minor Planets.

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Answer 2

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