Venus

Venus

In relation to the Sun, Venus is the second planet after Mercury, just in front of the Earth. It is the only planet t…
Stars

Stars

The luminous ball that enlightens us during the day is actually a star like all the ones you can see at night in the …
Multiply Connected Universes

Multiply Connected Universes

Is the cube a hexahedron? From a topological point of view, the shape of space depends on its overall surface. Thus, …
Mercury

Mercury

Mercury is the closest planet to the Sun. It orbits 58 million kilometers from the Sun, 2.7 times closer than the Ear…
The Center of Universe

The Center of Universe

We tend to say that the universe began with the Big Bang and then expanded. It is a metaphor, but everyone understand…
The Ring System of Saturn

The Ring System of Saturn

We speak of a system because there is not only one ring but countless, almost an infinity. The rings of Saturn are un…
Is The Universe Finite or Infinite?

Is The Universe Finite or Infinite?

The shape of the “world” has always aroused our curiosity. If we believe that the universe is finite, common sense lead…