Earth can scatter the seeds of life throughout our galaxy. Microorganisms can travel clumps of dust carried by the action of sunlight, says William Napier of Armaf Observatory in Northern Ireland. Scientists have since the nineteenth century pondered whether life to travel to outer space. Some researchers have speculated that a collision with another planet habitable celestial body is able to dissipate tons of matter in space carrying living organisms. Such deep-frozen spores can enter other worlds.
However, the likelihood of this scenario is very low. Disputes have to survive the collision and be ejected into space. Those lumps on which they will be, will have to leave the solar system and reach other habitable planets. Finally, all of this has to happen very quickly — the cosmic radiation can destroy all living things for not very long period of time. Thus, the usual detritus of past collisions by the time they reach the limits of the solar system, is absolutely sterile.
But microbes are able to survive if they would break off quickly pull of the Sun. And it can happen quickly, says Napier, if the stone on which they are located, will first be ground into dust.
Earth and surrounding planets pass through the clouds of particles called zodiacal dust. This debris generated by collisions in the asteroid belt, and as a result of the passage of comets. This dust can pulverize everything that passes through it. For stone diameter of about 20-200 meters grinding takes thousands of years, says Napier. If you break up any comet, as happens several times every million years, the number of zodiacal dust will increase and grinding fragments can happen in 500 years.
Gleanings diameter of 0.1 millimeters is still capable of carrying microscopic forms of life, and the pressure of sunlight to quickly replace them beyond the solar system. Such a particle of dust can be moved about six light-years from Earth in 70,000 years — far enough to reach other stars. So we can be surrounded by a giant "Biodisk" frozen organisms floating in space on dust particles — each of which is free to go beyond the solar system and back again.
Land can most effectively distribute the "seeds of life" by going through a giant molecular cloud — a lot of pulverized material from which stars are formed. Since the emergence of life on Earth is going on for about five times. And every time the estimated Napier, about three billion trillion microorganisms fell to earth in a cloud. According to him, the likelihood that some of them will get on some planet Earth-like high. A similar process may explain the appearance of life on Earth itself.
Battery News, 01.03.2004 9:53