How long does it take for intelligent life to develop?

Planetary scientist Pascal Lee of the SETI Institute proposes that this fraction is very low (0.0002). He based this estimate on how long it took Earth to develop intelligent life (1 million years since Homo erectus evolved, compared to 4.6 billion years since Earth formed).

How early are we in the universe?

The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. The earliest stages of the universe’s existence are estimated as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68\% confidence level.

Are humans alone in the universe?

Humans are alone in the universe and will never meet other intelligent life forms, according to a cosmically depressing new study.

Are humans the only intelligent life in the universe?

Humans May Be the Only Intelligent Life in the Universe, If Evolution Has Anything to Say By Nick Longrich October 22, 2019 We may be utterly alone in the universe.

Is there life on other planets in the universe?

The universe is astonishingly vast. The Milky Way has more than 100 billion stars, and there are over a trillion galaxies in the visible universe, the tiny fraction of the universe we can see. Even if habitable worlds are rare, their sheer number — there are as many planets as stars, maybe more — suggests lots of life is out there.

Are humans the only spacefaring aliens our universe has ever known?

It’s true that there are an astronomical number of possibilities for intelligent, technologically advanced lifeforms, but the huge uncertainties make it a very real possibility that humans are the only spacefaring aliens our Universe has ever known. The longest untethered spacewalk ever, by NASA astronaut Bruce McCandless, aboard STS-41-B.