A NASA scientist says intelligent aliens may have already visited Earth ...
Silvano P. Colombano says the extra-terrestrials would have looked hugely different to the carbon-based organisms currently roaming our planet. He says that 'super intelligent' aliens capable of interstellar space-travel would posses technology that humans cannot even imagine.
Dr Colombano told Califoria's SETI-backed Decoding Alien Intelligence Workshop back in March that scientists need to broaden their idea of what an extra-terrestrial would like like. 'I simply want to point out the fact that the intelligence we might find and that might choose to find us (if it hasn't already) might not be at all be produced by carbon based organisms like us,' his report read.
He added that scientists must 're-visit even our most cherished assumptions', which has implications for everything from an alien's lifespan to its height. 'The size of the "explorer" might be that of an extremely tiny super-intelligent entity,' he says. He believes scientists are too focused on pursuing signs of modern human technology on other planets.
This could mean missing signals of a civilisation inhabiting a planet far older than Earth, Dr Colombano argues. Our inability to comprehend how such a planet would look might even mean that we miss any signs of its existence. He said: 'Considering further that technological development in our civilisation started only about 10K years ago and has seen the rise of scientific methodologies only in the past 500 years, we can surmise that we might have a real problem in predicting technological evolution even for the next thousand years, let alone 6 Million times that amount!'
The space expert also claimed not every UFO sighting can be 'explained or denied'.
https://www.dailymail.co.uk/sciencetech/article-6457259/NASA-expert-says-alien-life-visited-Earth.html
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