(a) Now a distinguished observer of the universe and a proponent of underlying laws that govern it, Stephen Hawking has pointed out in a BBC programme that human beings need to colonize a planet soon and they must start in the next 100 years if the species is to be kept alive.
(b) Science fiction has traditionally used its imagination to show earthlings in a struggle with beings from another planet.
(c) Only recently in movies has the tide been turned towards making an attempt to colonize other planets, mainly Mars.
(d) This is because humanity is in danger of extinction because of climate change, overpopulation, chemical, and nuclear wars.
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