Is there any real proof that alien civilizations exist in outer space? What if someone were to say that Earth is the only inhabited planet in the whole universe? How would you respond?
I need to write a five-paragraph argumentative essay to prove that alien civilizations exist. I need to write an introduction, three paragraphs supporting my statement that aliens exist, and a conclusion. In each of the three "body" paragraphs I need to describe in detail a piece of evidence supporting my claim.
I don't even know where to start. I mean, I want to find out the opinion of some scientists who think that we are alone, and then disprove their claim in my essay. I need to know the latest scientific evidence on the existence of alien civilizations. I don't mean like alien abduction stories or any of that science fiction stuff. I need some real proof that will be convincing and not undermine my argument.
How can you know for sure if there are alien civilizations in outer space? What do they look like? On which planets do they live? What kind of technology do they use? Why are we not alone in the universe? What evidence disproves the claims of Earth chauvinists?