Enthusiasts around the world are looking for signs of the existence of alien life, some even had contact with aliens. Obvious evidence that mankind is not alone in the Universe, at the moment, was not provided. Scientists suggest that the answer is simple: we never see any aliens because they all died.

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Enthusiasts around the world are looking for signs of the existence of alien life, some even had contact with aliens. Obvious evidence that mankind is not alone in the Universe, at the moment, was not provided. Scientists suggest that the answer is simple: we never see any aliens because they all died.

Astrobiology from the Australian national University suggest that on other planets life surely existed, but at some stage, disappeared. The hypothesis of scientists is based on the fact that living things did not have time to develop so far as is necessary, to avoid, for example, space or global geological disasters.

the Nascent life is fragile and unstable young planet, scientists believe. As an example they talk about Earth, Venus and Mars, about 4 billion years ago is equally suited for life, but survived it only on our planet.

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