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Symposium 04 (第2/7页)
level it is today, The sun is suitable for the existence of life, If its mass is toe, it will burn too fast to wait for life to appear, Earth' s orbit is appropriate, it makes the temperature oh just right for life to exist, If Earth were in the orbit of Venus or Mars, it would be too hot or too cold for life to exist, The sun has a panion star called Nemesis, Every 26 million years or so, it collides with the Oort cloud region at the edge of the sor system, This number is very close to the cycle of mass extins oh, Mass extins oh seem to happen every 20 to 40 million years, ets from alien gaxies are the main cause of extin oh, The sor system will be bombarded by such ets, Frequent exge of material with other pary systems, Dust kicked up by et impacts be pushed by the pressure of sunlight, Flying outward at a speed of 108,000 kilometers per hour, faster than the retive velocities of two stars at close enters, This means that microbes may be able to take advantage of this process, Jumping from the sor system to another pary system passing by, The existence of life oh and the evolution of advanced life is also reted to the fact that the earth has
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