Seguimos con las clases de Astronomía y en esta tercera clase después de hablar delos planetas enanos, vamos a ver el resto de cuerpos celestiales que podemos encontrar en nuestro sistema solar: cometa, meteoros, meteoritos y asteroides
Después construiremos nuestro propio asteroide o meteorito y lo utilizaremos de decoración como roca lunar
Aquí os dejo unos vídeos tutoriales muy sencillo. Podemos hacerlo con globos o goma espuma / esponja. Necesitaremos cola y pintura acrílica o tempera. Es fundamental el uso de guantes
https://www.youtube.com/watch?v=25tGcbtMalk
https://www.youtube.com/watch?v=gyLPnb1IxrY
Let´s open the books
Astronmy 403. Other Celestial Bodies in the Solar System
In this lesson, we’re going to discuss the bodies in the solar system that are smaller than the planets: comets, meteors, asteroids... While these bodies are less influential than the planets, they nevertheless present some interesting magical findings, so without any further ado, let’s hop to it!
Comets
A comet is a small body that’s composed of water ice in addition to various other ices, like frozen methane and carbon dioxide, as well as rock and dust. Their sizes range from a few hundred meters to tens of kilometers. If one passes close enough to the Sun, it gets warm enough that the ice melts and evaporates into an atmosphere, called the coma, consisting of gas and dust. The remaining solid part of the comet, meanwhile, is called the nucleus. The most famous comet, Halley’s Comet, was named after Edmond Halley, the English astronomer who, in 1705, discovered its period of about 75 years. The last time it was seen was in 1986, so it will return in 2061. That’s something for you young folks to look forward to.
Meteors, Meteoroids, and Meteorites
This flash of light is commonly called a shooting star, but its proper name is a meteor. It is caused by a small object entering the Earth’s atmosphere, where it is heated by friction until it becomes incandescent, leaving a trail of glowing particles behind it
The objects that cause meteors are called meteoroids. Most of them are about the size of a grain of sand and vapourize entirely in the atmosphere, but occasionally one comes along that is large enough to survive and hit the ground, and then it’s called a meteorite. If the impact of a meteorite is energetic enough, it will leave a crater - a hole in the ground that’s much bigger than the object that created it.
Asteroids
An asteroid is like a meteoroid, only bigger – that is, more than 100 meters across. The largest known asteroid, Ceres, is almost 1000 kilometers in diameter. Asteroids differ from comets in that they never acquire an atmosphere, because they don’t have any ices to evaporate if they pass close to the Sun. They are divided into three groups depending upon what they’re primarily made of: carbon-rich, stony, and metallic. Most asteroids are located in the asteroid belt, which is between the orbits of Mars and Jupiter. Some are closer to the Sun, and of those, a few come close enough to Earth to be called near-Earth asteroids. Astronomers keep a close watch on near-Earth asteroids because there is always the chance that one of them could hit Earth or explode nearby, with results ranging from mildly dangerous to catastrophic
comet meteroid asteorid
text and photos provides by Hogwartishere
text and photos provides by Hogwartishere
No hay comentarios:
Publicar un comentario