Scientists believe that Mars managed to avoid collisions with other nascent planets
Mars formed in record quick time, "only" for three million years. This is faster than scientists previously believed.
The speed of this process explains why the mass of the planet is about ten times smaller than the mass of the Earth.
The study, published in the journal Nature, confirm the theory that Mars was a small planet, as he was able to avoid collisions with planetary "building blocks."
In the early stages of the solar system the sun was surrounded by a cloud of gas and dust.
Scientists believe that the planets were formed out of matter with particles attracted to each other by electrostatic charge.
Subsequently, these components will increase in size and become what scientists call "embryos planets."
These structures had a considerable force of gravity, acting and other emerging world.
Sometimes miniplanety proved whipped from its orbit and collided with other objects composed of solid rock.
Clashes could lead to the fact that the emerging world have found themselves beyond the solar system, or even broken up into smaller parts.
Of the fragments formed other celestial bodies.
So, the moon, according to one version, was formed by a collision with another fledgling planet Earth.
By modeling this process, astrophysicists can determine the size of the planet, depending on its distance from the Sun.
Mars is far away from the center of the solar system, the theoretical size of the planet should be about the same as the Earth, but the Red Planet is ten times less.
Scientists have long believed that Mars was able to avoid collisions with other objects, in contrast to the planets, which increased in size as a result of such collisions.
To test this theory, the specialists of the University of Chicago (Illinois) and the University of Miami (Florida) studied the chemical composition of meteorites.
Comparing the concentration of thorium and hafnium in the 44 space objects, scientists were able to establish the period during which formed Mars.
As experts believe, it took about 2 to 3 million years. For comparison — the Earth was formed to its current size of a few tens of millions of years.
According to one of the study participants Purmanda Ali, when the formation of the Earth, Mars has reached its present size.
It is possible that Mars remained small because of the fact that he was able to avoid collisions with other planets.
"I guess it was just kind of a coincidence," — said the expert in astrophysics Duncan Forgan of the University of Edinburgh in Scotland.
Forgan notes that the modeling of planetary development is much easier to set the general course of events, but very difficult to understand what is happening with specific planets, such as Mars.