Reply to post: Re: "Aliens exist, there’s no two ways about it,"

Is there alien life on Earth? Maybe, says Brit 'naut. Well, where did they come from? How about this far-away cluster. Or this 'Godzilla' galaxy...

Brangdon

Re: "Aliens exist, there’s no two ways about it,"

First in this galaxy is plausible. First in the universe is less likely.

Our galaxy has around 300 billion stars. If you look at how many steps were involved in getting to intelligent life on Earth, it's easy to believe it's so astronomically unlikely that it is a rare event even with that many stars. (Eg going from simple single-cell creatures to complex single-cell creatures, or going from single cells to multiple cells.) We also don't know how important and rare our Moon is, or whether it is necessary to have at least two planets in the habitable zone. Nor do we know how long intelligent life survives for when it does evolve. The odds of us remaining a high tech civilisation (eg, able to use radio telescopes) for the next 500 years don't seem that great. When people take the Drake equation and set all the unknowns to 1%, they are being unimaginative.

However, the number of galaxies in the universe seems unbounded, so there is probably intelligent life in other galaxies. Too far away to visit or communicate with.

POST COMMENT House rules

Not a member of The Register? Create a new account here.

  • Enter your comment

  • Add an icon

Anonymous cowards cannot choose their icon

SUBSCRIBE TO OUR WEEKLY TECH NEWSLETTER

Biting the hand that feeds IT © 1998–2020