Astronomy 402. Other Celestial Bodies - Dwarf Planets

Seguimos con las clases de Astronomía en este cuarto curso de primaria. El año pasado hablamos de los planetas y los dividimos en dos grupos: los planetas gigantes y los planetas pequeños ( también denominados planetas lejanos o planetas cercanos)... Este año empezaremos a hablar de los otros cuerpos celestiales que ocupan nuestro Sistema Solar. Primero veremos los planetas enanos

Después vamos a hacer una lampara con un diorama de los planetas

Aquí os dejo una página donde explica como hacerlo

https://www.maquetashistoricas.com/como-hacer-una-maqueta-del-sistema-solar/

Let´s begin the class. Today we will begin the Solar system study and we are going to continue with the celestial bodies. In this light we are going to continue learning the Planets in the Soar System. Remember last year? Yes?-.... We talked about the inner and outer Planets (or Rocky and Gas Planets)... This year we will begin with the Celestial Bodies smaller than the Planets: The Dwarf Planets

https://www.youtube.com/watch?v=YZfi89JiXKM

https://www.youtube.com/watch?v=OBN2idZbBKo

Astronomy 402. Other Celestial Bodies in the Solar System - Dwarf Planets

A dwarf planet isn’t just a smaller version of a planet: the term doesn’t refer to size but to criteria decided upon by the International Astronomical Union in 2006. According to the new definition, a planet has to satisfy three conditions:

1. It orbits the Sun or another star, rather than another body.

2. It has enough self-gravity for its shape to be nearly spherical.

3. It has cleared its orbit of space debris.

An object that satisfies the first two conditions but not the third one is now deemed a dwarf planet. Five bodies are currently classified as such and were so classified in the following order: Pluto, Eris, Ceres (also the largest known asteroid), Haumea (which is elongated because it rotates so fast), and Makemake. The image below shows them in order of size.

Pluto has the most known moons of any of the dwarf planets: Charon, Styx, Nix, Kerberos, and Hydra. Ceres, on the other hand, has no known moons. Haumea has two moons, Namaka and Hi’iaka, while Eris and Makemake each have one. Eris’s moon is Dysnomia and Makemake’s doesn’t yet have an official name, but its nickname is MK 2

Like the planets and the Moon, the dwarf planets do reflect magic to Earth. The other dwarf planets are either too small or too far away for their magic to have any noticeable effect here.