Well as per einsteins theory of relativity, if u can travel at a speed more than light, time slows down for you. Also time on earth and in space is differnt. In space time is four dimensional.I Dont want to grab attention here or get involved into verbal fights with belivers but i guess some gods are assumptions and some are extension. Lord ram krishna could be real humans like us but people worshiped them like gods like how ppl worship Shivaji, Ambedkar etc. There were alien series on NGC which illustrated imaginations. Even they showed Shrinivasa Ramanujan could have pickeup mathematical geniusness from aliens. I agree bro believer and scientific person like you and me could tend to belive our hindu religious books and believe alien series at same time.
So i belive life could surely be existing plenty numbers of stars in mily way or nearby Andromeda or even throughout cosmos but aliens coming to earth is very difficult. Our nearby star is alpha centuri which is 4.3 light years apart from our sun. So if alien life exists there they need to travel 4.3 years in space craft which will be traveling with speed of light ie 3Lac km per second. If they put couple of seconds more or less they may land on mars or venus etc. How can they arrange that much food drinks into spacecraft which will help them for 4 years? Also each planet gravity is different hence taking off or landing has to be done presiely correct and if aliens are landing for first time how they will know gravitational pull for earth is 9.81 m/s^2? We are used to oxygen but if aliens are not how they will be able to arrange breathing air for that long? I may be wrong those are my thinking but life is very complex and reality could be very different than what all of us could ever be able to imagine
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Well star trek gave us warp speed and avengers gave us time travel.
As per aliens are concerned as stephen hawking said if aliens r thre thy already hv visited earth and will not come again as earth is in decaying stage.
So now we r tryng to go to mars. If we reach thre and successfully create life thre, will we become gods for the martians if they exist and if they r genetically inferior to us. Cos we will be doing sumthing which we hv read abt in all the books.
Food for thought.
Regards.