Ever since man has been aware of worlds beyond our own, he has begun to wonder whether he is alone in the Universe. Do other races of creatures very different or perhaps quite similar to ourselves exist on distant planets? This desire to explore beyond the confines of our world and to imagine what possible life forms could exist on other planets has let science fiction writers to describe all kinds of strange creatures. In the first men on the Moon, H. G.Wells tells of a species living in the craters and caves of the Moon that he calls the Selenties. These creatures resemble giant, intelligent ants. Of course, we are aware today that no such creatures exist and there never has been any form of life on the Moon, least of all the ‘Man in the Moon’. There have been other creatures from the Pages of science fiction such as the Mekons with tiny green bodies and huge heads whom Dan Dare met in his space travels in the Eagle comic. More recently, television has brought the terrifying, war-like Daleks who confronted Doctor Who in the programmed of the same name.
These are just a few of the imaginary men from outer space, but what are the possibilities of actual life forms? The first point to make is that there is little to be gained from trying to picture weird and wonderful creatures sprouting radio antennae from their heads and breathing liquid ammonia. We should try to confine ourselves to examining whether or not there is any chance of living systems much like our own somewhere else in the universe. It must also be remembered, however, that a living world elsewhere could be more or less developed than our own. In other words it could still be at the stage of a ‘primordial soup’ of primitive life forms or thousand of years more advanced than our own world.
Scientists have attempted to calculate how many galaxies there are in the Universe and how many solar systems are contained within these galaxies in a effort to work out how many planets there might be similar to our own. Even the most cautious would probably agree the number of planets in the Universe similar to our own probably runs into the thousands. This means that the chances are heavily in favour of there being many other worlds just like our own in which there are plants and animals and humans breathing air made of oxygen, nitrogen, carbon dioxide, and a few others gases.
Are these intelligent creatures trying to make contact with us using radio waves? Some people think so, but of course, they may be thousands of light years away so that by the time we received any message, they could be extinct. The possibility exists that we have already been visited by spacemen and that such wonders of the world as the Pyramids of Egypt were constructed with their help. Perhaps soon we shall know more of the creatures from outer space.
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