Hawking believed that spreading out into space is necessary for human beings because we are the leaving out from the space. There is a need to find out the new world.
Who was Hawking?
Stephen William Hawking was an English computer scientist, astrophysicist, and philosopher that functioned as research director at the University of Cambridge's Centre for Theoretical Cosmology until he died.
He believed that we are living from the present space, and we have to find out the new space for living, due to this reason, he told that the spreading out into space is necessary for human beings.
Therefore, he believed that the spreading out into the space is necessary.
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