There are the logistical difficulties of finding intelligent aliens. The universe is enormous and incredibly old. Humanity has been around for just 200,000 years, and we've been listening for possible radio signals from E.T. just since 1960. So the odds that we overlap in time and space with a detectable alien civilization don't seem great. There are now more than 4,500 confirmed exoplanets(opens in new tab), with more being found every year. The sheer number of alien worlds suggests that life may be plentiful throughout the cosmos. Over time, with more advanced telescopes, scientists will be able to probe the chemical compositions of some nearby exoplanets' atmospheres. Until that time, famous Fermi Paradox on this matter, remains dissolvable.
Of course.now we think there are lives in the earth because there are water soil air ,some elements to create the life.But who says only those elements can be the sources of lives.Maybe in other plant the alien inhale carbon dioxide exhale oxygen instead.
I believe they exist, tho i like to think they do in the movie kind of way, they probably do as microorganisms or as maybe less intelligent life forms (not saying they're dumb, just differently made?), tho i like to think that since they say once upon a time there were rivers in Mars, maybe life was already there, but ceased to exist and we in earth are now living what they've already lived,,, got a little existential there
I would say probably... they're probably very different than humans though, like maybe they're just clumps of cells on other planets, or maybe giant beings. Who knows
They surely exist.之前看过一个笑话---外星人👽👽👽雄赳赳气昂昂的入侵地球,最后被公园里老大爷的狗子吃了😂😂😂。Just want to express the idea that aliens may not be stronger or more civilized than humans at all.Though definitely there's a chance.
I believe in Aliens, I recomended book of Marco Pizzuti Unauthorized Close Encouters,it talk about many things that have been kept hidden from us for a long time at a political level, I would recommended al the books by this author.