Most Helpful Guy
yes, but I don't believe any has ever visited earth before1
Most Helpful Girl
1. Life on earth thrives in the harashest conditions even in deep sea where the pressure is high and no light shines.
2. There are hundreds of billions of star systems like our own in the milky way galaxy alone.
3. We are proof. If life thrived here on earth then it can certainly thrive somewhere else.
Why haven't we been visited? Space is too big of a place to travel from star to star. Even traveling at the speed of light (impossible), it will still take more than a life time to get there. Also, there's no material or metal known to man that can handle space conditions outside in deep space. Nano particles will tear apart any material made known to man.
I'm a physics and astronomy major... Science is my passion (::::
So yes aliens for sure exist but we won't ever ever meet.1