Photo source: Nature / ESA / G. Neukum
Levison and his team built on more accurate research models on how small stones form planets, observed in galaxies today. Meanwhile, the simulation before, both large and medium-sized models, destroyed planets the size of pebbles by a relatively stable ratio. But Levison's simulation shows that larger samples act like " bullying ", " snatching " stones from mass-sized, medium-sized pebbles to grow at a faster rate. .
" Larger specimens now tend to disperse smaller samples than small samples that disperse them, so smaller samples end up dispersing out of the pebble disk", co-authored. research author Katherine Kretke, also from SwRI, answered Space.com. "Basically, older boys often bully smaller boys to be able to eat all the pebbles and continue to grow to form the core of giant planets ."
Like all other planets, Mars heats up when formed by energy from collisions. Inside the planet melted and the iron-like particles sank to the center, forming the core. The lighter silicates (silicon anionic compounds) form the mantle crust, the " least dense " silicates that form the shell. Perhaps, Mars had a magnetic field several hundred million years ago, but when this planet Mars " cooled ", this magnetic field also " disappeared ".
The young Mars planet has active volcanoes , spraying lava onto the surface; Water and carbon dioxide enter the atmosphere. However, there is no tectonic activity on Mars, so volcanoes do not move and develop only when erupting.
" It seems that volcanic eruption can also help Mars have a thicker atmosphere. Mars's magnetic field protects the planet from radiation and solar wind. At a higher atmospheric pressure, water will But about 3.5 billion years ago, Mars began to cool, the volcanic eruption became less and less and the magnetic field disappeared as well. blown away and the surface of Mars was bombarded by radiation, "the study showed.
Under these conditions, liquid water cannot exist on the surface of Mars. Studies show that water is trapped underground in both liquid and freezing form; and in ice sheets on the polar ice cap.
As far as we know, life exists when water is in liquid form, so there is a lot of interesting evidence found on Mars.