First Blog // The Planets ° ★

Hi this is my first blog i'm going to write, this is going to be a little astronomy class about the planets, all the information comes from a book i have.

My english is not that good so maybe there are some mistakes, so please i will appreciate it if you don't mind.

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The Planets

Planets are very common celestial bodies in our galaxy.

A planet is a spheroidal body that orbits around a star and does not have a mass capable of triggering a nuclear fusion reaction inside it, therefore it does not have its own light.

The term comes from the Greek and means "wandering", since these types of objects with the naked eye resemble stars and move slowly in the celestial sphere. The light they emit is reflected solar radiation (the ratio between the sunlight they receive and the light that returns to the outside is known as "albedo").

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Planets in our solar system

The 8 planets of the solar system are divided into 2 groups: the 4 inner and rocky planets (Mercury, Venus, Earth and Mars), which share some physical characteristics, plus they also have orbits closer to the Sun than the other 4 outer planets(Jupiter, Saturn, Uranus and Neptune), which are much larger and have a similar structure: they do not have a solid crust and are made up mainly of gas.

The gas giants in our solar system (Jupiter, Saturn, Uranus, and Neptune) are largely made of gas, although they likely have rocky cores.

This type of planet includes objects with a mass 10 times that of Earth and 70 times less than that of Jupiter. Apart from this, the heat and pressure inside the celestial body causes a small nuclear reaction that turns it into a small star. Sudden and irregular changes in the appearance of its surface are typical: being fluid, it presents various streaks and changing spots.

The eight planets in our solar system vary widely in mass and size: Jupiter is more massive than all the other planets combined, while Mercury, the smallest of all, is 5,750 times smaller than Jupiter.

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Kepler-90 System

Not many years ago, astronomers managed to prove the existence of planetary systems on stars other than the Sun. With the discovery of an eighth planet, the Keplet-90 extrasolar planetary system was the first with the same number of components as our own (the maximum observed so far). The image, a recreation of both planetary systems, reveals the differences in structure and size between their respective components.

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Ceres 

Located in the asteroid band between Mars and Jupiter, Ceres was listed as a dwarf planet in 2006, along with the former outer planet Pluto and other similar bodies. They are massive enough to have a nearly spherical mass, unlike asteroids, which show an irregular structure.

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Well that was all the blog,

I'll probably keep writing about these topics, so if you want me to comment on something specific, just ask me.

Thank you for reading,

Blue Nebula ★.