1 yes believe in the possibility of life on other planets, last I checked they had discovered over 700 exoplanets and they keep discovering more, it's also possible that some sort of life exists in this solar system I think Europa (one of jupiters moons) is a prime candidate and I also think it's possible there may have been life on mars billions of years ago however I would need to see conclusive proof to believe it's %100 true.
2 I highly doubt aliens have ever actually visited earth in the past or even now like I said before I would need to see conclusive proof that this has happened and when I say conclusive proof I mean real evidence and not the claims of some stoner or some conspiracy nut.
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