Frequently asked questions about the planets

Hello and welcome. Today we bring an article about questions and answers in relation to the planets of our solar system. So don't lose detail and soak up a bit of general culture.

Let's get to it...

Why are the planets round?

The Earth, like the Moon, the Sun, all the planets and all the stars, have spherical bodies. Although this is obvious to everyone, not everyone can explain it, so let's make some sense of it.

The person responsible for this natural phenomenon is the same one that makes us stand up on our terrestrial soil:the force of gravity.

Gravitation or force of attraction

This interaction is also called "force of attraction". In fact, according to Isaac Newton's discovery, the force of attraction is proportional to the product of the interacting masses, and inversely proportional to the square of the distance that separates these bodies.

Does it look Chinese to you? Ok, this is equivalent to saying that the closer objects are and the heavier they are, the more they attract.

This is how the planets of our solar system were formed 4.6 billion years ago, by accretion of small dust grains, which grouped together in larger and larger clusters, thus attracting other clusters, etc

You should know that the gravitational force is exerted identically in all directions, so the planets grow equally over the entire surface.Do you now understand why the planets are round? ?

How did the planets form?

Since the birth of our Universe, estimated today to be about 13.7 billion years old (according to the Big Bang theory, supported by Albert Einstein's Theory of Relativity), matter "created " has continued to organize and become more complex.

Similarly the first stars grouped in galaxiesappeared. Over time, many of these first-generation stars died, releasing their outer matter and increasingly seeding the interstellar medium of our galaxies.

Our solar system and everything in it - the Sun, the planets, the comets, the Earth, and ourselves - arose from the death of these first (or even second) generation stars.

What is a planet and how is it different from a dwarf planet?

In August 2006, in Prague, the general assembly of the International Astronomical Union was held, to redefine the characteristics of a planet.

In this, a vote was organized, which resulted in a new hierarchical organization chart. This encounter marked a turning point in the history of astronomy because, for the first time, a planet was stripped of its title: Pluto.

In fact, after the increasingly numerous and embarrassing discoveries of atypical planetoids in the Kuiper belt; facts had to be faced: either Pluto had to be removed or dozens of planets had to be added to our solar system. Thus, a new caste was created to solve the problem: the dwarf planets, in which Pluto was integrated.

Today a planet is defined by meeting several criteria:

  • Being a celestial body orbiting the sun.
  • Be massive enough for its gravity to ensure a hydrostatically balanced shape, that is round (or nearly so).
  • To have cleared its orbit of all matter.

A celestial body is a dwarf planet if it meets these conditions:

  • Being a celestial body orbiting the sun
  • Be massive enough for its gravity to ensure a hydrostatically balanced shape, that is round (or nearly so).
  • Not having cleared your orbit of any matter.
  • Don't be a satellite.

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