Elon Musk, 48, this week (November 12) dropped an alien bomb on a Lex Friedman artificial intelligence podcast. Speaking about the allure and dangers of AI technology, the SpaceX boss also discussed the danger of staying on one planet forever. The South African billionaire, best known for his dream of colonizing Mars, said the universe was probably full of alien civilizations long ago.
Mr Musk said: "It's funny, the universe is 13.8 billion years old. Earth as four and a half billion years old.
"In about half a billion years, the Sun will expand and probably evaporate the oceans and make life on Earth impossible.
"Which means that if we had to develop consciousness 10 percent longer, then it would never evolve, 10 percent longer.
"And I wonder how many dead one planetary bodies are there in the cosmos that never made it to another planet and eventually disappeared or destroyed by external factors? Probably a few. "
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The "other planet" that could be saving the grace of mankind, according to Mr Musk, is Red Planet Mars.
The SpaceX boss is a firm believer that mankind is on the brink of colonizing the neighboring world.
Towards this end, he is developing SpaceX's "spacecraft" spacecraft – an interplanetary vehicle launched to transport people to the moon, Mars and beyond.
Mr Musk said: "It is only possible to travel to Mars. Just barely.
"If G were 10 percent more, it wouldn't really work. If G were 10% lower, it would have been easy.
"You can go into a mobile phase from the surface of Mars to the surface of the Earth because Mars is 37 percent of the Earth's gravity or the environment.
Mr Musk, however, noted that there were still no signs to prove intelligent or advanced aliens that currently exist outside the Earth.
He said: "As far as we know, we are the only consciousness or the only life that is there."
But the statement does not exclude his theory of long-lost civilizations that once evolved before the rise of mankind.
Mr Musk is also one of the 27 experts in space who has warned that they will inadvertently try to communicate with extraterrestrial civilizations.
In 2015, Mr Musk signed a document calling on world leaders to consider the consequences of contact with foreign parties.
The document says: "As new technological species, it is wise to listen before we shout."
Mr Musk also expressed concern about the rise in unprepared artificial intelligence.
In a post by Lex Friedman he said: "In general, we have come to the conclusion that it is important to have a government judge or a judge serving the public interest to ensure that things are safe when there is a potential danger to the public.
"I would argue that AI is unambiguous something that has the potential to be dangerous to the public and therefore needs to have a regulatory agency just like other things that are dangerous for the public to have a regulatory agency."
Are we alone in the universe?
The issue is one of the most pressing facing scientists and astronomers around the world.
For decades, space agencies like NASA have been trying to break the mystery and find signs of alien life on Earth.
NASA said: "For millennia, people have turned to the stars and wondered if there were others like themselves there.
"Does life, similar to ours or not, exist elsewhere in our solar system? Our Galaxy?
"By 1992, when the first exoplanet was confirmed, it was not certain if there were even planets outside those in our solar system.
"Today we know about over 3850 planets around other stars and thousands of contenders for the planets."