*Extraterrestrial(ET) means 'outside the Earth'.
*Some scientists say that ET life could develop anywhere in the Universe where there is a flow of energy.
*One extreme idea is that space clouds could become sentient(thinking) begins.
*Most scientists believe that if there is ET life anywhere in th Universe, it must be based on the chemistry of carbon, as life on Earth is.
*If civilizations like ours exist elsewhere, they may be on planets circling other stars. This is why the discovery of other planetary systems is so exciting(see planets).
*The Drake Equation was proposed by astronomer Frank Drake to work out how many civilizations there could be in our galaxy-and the figure is millions!
*There is no scientific proof that any ET life form has ever visited the Earth.
*SETI is the Search for Extraterrestrials Intelligence-the program that analyzes radio signals from space for signs of intelligent life.
*The Arecibo radio telescope beams out signals to distant stars.
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1000 Things You Should Know About Space
Non-FictionWhat is written here are facts and about true reasearch of SPACE
