Science is awesome.
You can't guarantee squat.. and if you can, I suggest you show the relevant authorities your irrefutable evidence for other life, because that's probably fairly important.
PHILK - i think you mean Intelligent Life -
Life - Bacteria or remanants of it has been found on minerals not of this world !
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I personally beleive that Intelligent life ( or EBE 's, Extraterrestrial Biological Entities have visted earth i think they are attracted to Nuclear technologys, Roswell new mexico is right next to white sands testing grounds ( testing ground of the nuclear weapon , its my understanding that in the 80's there was alot of sightings in the sky around ingleburn - lucas heights area !
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why i started looking into ET life was i saw something in the night sky one morning .
I was living in the whitsundays on Hamilton island one morning going to work at around 4.00am between the mountain and a 19 storey hotel i cant tell you what i saw but it flew slient ( No sound ) lighting speed between a mountain and the 19 storey hotel , the mountain and hotel are very close and hug each other ( min distance ). my first thoughts were what can travel at such a speed (supersonic speed ) with no sound at all ! nothing i know of !!!! there was no rushing of air noise or any other noise i could hear !
i went to work and told somebody i worked with and about 3 days later they came back with a mainland newspaper that reported several people seeing the same thing unexplained oject around the whitsunday islands !!
as for Hittler researching disc technology.
germany at the time were working on vertical lift aircaft so there bombed runway would not effect there ability to defend german in the sky, a craft that can take off without the need for runways would not effect germanys air defences.
Many scienists after the war were sent around the world including USA - to work on Nuclear weapon program and even Australia to work on Various australian projects.
germany at war invented some great world inventions of their time
In fact - you can't even guarantee that there's worms or bacteria... in fact, you have NO proof what-so-ever.
The scientist in me suggests (Like Dana Scully) that if life exists out there, then we'll need to prove it the good ol fashioned scientific way. Right now - there is not a shred of evidence to prove life exists on other planets... end of story!
Earth was incredibly lucky to get life - really really lucky!!!
I thought sciencists were to be open in theorys !! never to discount the unforseen !!
NASA Finds Evidence of Alien Life on Meteorite | Alien Life Discovered
Arsonic based life forms not carbon based
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NASA scientists discover new form of life: bacteria that eat arsenic | Smartplanet