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There is one big scientific topic which has not been solved yet; the existence of alien life.
>>> Good sentence!
Until now, we have not been found any clear evidences about it, though we are trying to do that very hard.
>>> We haven't found any clear evidences no matter how hard we try.
Scientists agree with that Earth is extremely lucky.
>>> Scientists agree that Earth is extremely lucky.
For there to be life, a lot of environmental factors of the planet must be “suitable".
>>> Good sentence!
First, the planet must have its own solar system.
The solar system should not be very big or small and the planet should also have suitable size and weight; it is related to its gravity.
The gravity should also be moderate.
The temperature should not be very hot or cold.
>>> Good sentence!
Above all, there must be the liquid status of water.
>>> Above all, there must be water at its liquid state.
From these, they are just basic conditions.
>>> These are just the basic factors.
For evolution to be higher organisms, it needs more sophisticated conditions and luck.
>>> Evolution of higher organisms need more sophisticated conditions and luck. |
