Vidulini
It is known that prolonged exposure to solar radiation causes visible changes in human skin. Often they can be very dangerous for human health, but to respond to long-term exposure to small celestial bodies - asteroids? Will their surface ("skin") to be ruined after long exposure to the sun? Can not you view the color of the surface of an asteroid to conclude how old they are, what is their composition of the soil, where they potovali ..?
Artistic representation of the impact of the solar wind on asteroids
The team of astronomers from the European Southern Observatory (ESO) in his research of small celestial bodies in the solar system came to a result that shows us how the Sun affects the asteroids. Clearly, it is not the same mechanism of radiation effects on man and the small celestial body. While we are exposed to UVA, UVB, and other types of radiation (which in excessive doses adversely affect the appearance and health of our skin) also have the Earth's magnetic field and atmosphere are significantly protected from dangerous solar wind!
Asteroids are not. They have no atmosphere and no magnetic field (indeed, some have it but it is too weak!) That would preserve the size of the destructive actions of the solar wind.
Most of the old asteroid, resulting in the time of formation of planets, or slightly later, mostly with dark craters and battered površinu.Tamniju because the solar wind their work literally burned material on the surface. They are younger, formed later, or collision occurred two or more celestial objects are usually lighter and less shock formation.
Millions of years in the cosmic scales are only seconds or minutes, compared with the human lifespan. It takes almost a billion years to get a piece of heavenly bodies, for example, freed from the inside of a larger body destroyed in a crash, "nakvarca" Martian in a darker color, as opposed to "bright moon" he had in a moment of origin.
Parameter space of time units for 24 April
Understanding these processes largely explains the evolution of asteroids, the frequency of collisions, their trajectories, the influence of solar wind and cosmic time and has implications on the issue of meteorites found on Earth.
Although this is an area of astronomical research is in its infancy, but preliminary results were first able to explain the differences in the structure of meteorites from asteroids. Distance from the Sun, his activity, collisions in the planetary system, the impact of large celestial bodies (planets, especially Jupiter) as it affects small icy boulders that are everywhere around us. Just like humans, and over time they encounter a number of events and occurrences that leave a mark on them.
Marino Tumpić
