How much do we know about our star? What do we know of the light that reaches us? These questions are connected to each other and we going to talk about our star, the Sun.

But… (What do we know?)

We know that the Sun is only a star among millions of stars that inhabit our galaxy, the Milky Way. The Sun is at a distance of 27.000 light-years from the galaxy centre and has two movements: rotation and revolution.

Another important characteristic of the Sun it is its mass and radius. Through this data guess how big it is if we compare it with the Earth. Its radius is 6,96*103km and its mass is 2*103kg, about 333.400 the mass of the Earth.

The Sun has other phenomena such as coronal mass ejections, solar winds or sunspots, but in this post we going to talk about coronal mass ejections.

Coronal mass ejections are explosions where the Sun ejects solar material and particles with a lot of energy. These explosions are a bit dangerous when they arrive at the Earth because they can disrupt communications and cause damage to satellites. When solar particles reach the Earth we can see them at the phenomenon known as aurora.

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 Although it appears that we know the Sun, we really do not know many of its secrets. In the following posts, we will talk about another phenomenon and little by little we will improve our knowledge about our star.

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