I’m a STEM graduate and scientist- retired now
i think we have plenty of theories why life exists on other exoplanets- nearest likely candidate being 4.7 light years away.
but I think it’s an entirely different kettle of fish whether they could travel here, let alone have travelled here
- based on our technology of space travel we’re talking 8,600 years to get here even from closest possible candidate
- there are literally thousands of people watching the night sky as astronomers , both professional and amateur every single day, all over the world, using all sorts of instruments including old school lenses and visual light, to radar etc . We’d see anything coming towards us literally years out - but all we ever get is “ close encounters” within our atmosphere. People will say they will have to technology to evade detection- well f that’s the case why the hell stop that once inside atmosphere, not very logical is it? I don’t believe any conspiracies that a world full of astronomers have all been kept quiet
- the sheer amount of energy to send any craft , especially manned, on a journey of that length is mind boggling if it had ability to escape detection years out. When we send craft into deep space we send unmanned craft, and use gravity to sling shot and little actual power - even a nuclear fission powered craft wouldn’t have the energy required to fly close to speed of light through that distance. The observed laws of physics and chemistry, and to an extent biology, are universal. Yep, we have theories on how stuff works,we revise, update theories all the time and there’s massive questions still to be answered in terms of quantum physics etc - but what we observe is universal and a lot of what we know on laws of physics and astronomy is based on deep space observations. We know black holes exist, we have a pretty good working theory on what they are and why, based on those universal observations . Those universal laws are just that-applicable to the whole universe. The basic chemical building blocks don’t change in different parts of universe, nor does gravity . Any alien technology still had to overcome those basic immense challenges of how to energise a craft to get here, keep the aliens alive and their biological life form resistant to effects of zero gravity and aging cells, and somehow magically not appear until they’re n earths atmosphere, get home again ( presumably 🤷🏼♀️).
- The risks in doing that as any life form are immense - yep, unmanned craft I could buy into , quite possible if it was launched 1000s of years ago, but manned craft? Hmm , don’t buy it. There would be few people in this world ( aside from Elon musk types) that would give up their life to be put into some sort of suspensed life for decades to travel to find worlds with life forms, when they don’t know they exist ( well not for first visit !) or could have even more advanced technology then them to annihilate them instantly even years out.
it’d be a big shock to me if I’m wrong🤣🤣🤣🤣