Are humans truly from another planet?
Could the human race have originated from another planet?
With the human race ecologically dominating the earth, have we altered the evolution of other species? How might the human race develop differently if we knew that there were alien civilisations actively shunning us in our galaxy? What if we weren't the original people of earth and we killed off a race to have earth? What if the human race is the first intelligent life to emerge in the universe? Could that be why we haven't made contact with alien life? If all humans descend from a single original population of ancestors in Africa, then how did humans with different skin colors come about? Why other species on the earth have not evolved as human? Has it been determined that some human races have evolved differently than others in specific respects? What would it be like, had there been 2 intelligent species on earth, rather than just humans? Is there a biological basis for different races? What would be different if Mars had complex life around our level of civilization, and had a similar biosphere to earth? If we found a habitable planet but it already had sentient inhabitant, would we try to conquer it? Why didn't any of the other planets in the Solar System evolve the conditions for life as we know it, given that they were created by the same process? Can the human race become extinct? If humans evolved from apes, how was the first human created? Wouldn't any other planet be completely inhospitable to our biome. Aren't we confined to earth because we are made of earth? Did humans evolve from single celled organisms? Could a civilization more advanced than ours have existed on this planet millions of years ago? What evidence could we use to rule out the possibility? I dreamt that an alien civilization from another galaxy shot microbes into space billions of years ago, which started life on earth. Is this possible? Humans evolved from apes and apes still exist. Has this happened with other species, when the species co-existed with its evolved form? After generations of interracial mixing, in future will there be only one human race, with no regional differences of characteristics and appearance? How would the world be different if humans evolved from birds rather than monkeys? If all humans died, would we evolve again from apes? How important would be the finding of another planet in our solar system? Is it scientifically possible to terraform a planet? If all the humans left the earth and came back after 100,000,000 years would the chimpanzees/monkeys have evolved and built technologies like ours? Is it evolutionarily feasible to imagine a planet where a highly advanced species evolved, went extinct, and then a new, but somewhat less intelligent species evolved later and was bewildered by the artifacts left by the previous species? Will mankind turn Earth into another Venus? How would society respond if we discovered that there is an interstellar 'human' empire out there in the galaxy? When did life originate on our planet? Is it possible that every planet in our solar system had life at one time?