Cable Forum - Stephen Hawking warns "we should avoid aliens"

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Hugh	02-12-2010 23:05

Re: Stephen Hawking warns "we should avoid aliens"

No worries :)

TheDaddy

05-04-2023 13:20

Re: Stephen Hawking warns "we should avoid aliens"

Might be our last chance to avoid them, seems like boffins have discovered coherent radio waves a mere 15 light years away :shocked:

Hugh	05-04-2023 13:27

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by TheDaddy (Post 36149309)

Might be our last chance to avoid them, seems like boffins have discovered coherent radio waves a mere 15 light years away :shocked:

Probably not….

https://www.nature.com/articles/s41550-023-01914-0

Quote:

Models of sub-Alfvénic SPIs predict that terrestrial planets in close-in orbits around M dwarfs can induce detectable stellar radio emission, manifesting as bursts of strongly polarized coherent radiation observable at specific planet orbital positions. Here we present 2–4 GHz detections of coherent radio bursts on the slowly rotating M dwarf YZ Ceti, which hosts a compact system of terrestrial planets, the innermost of which orbits with a two-day period. Two coherent bursts occur at similar orbital phases of YZ Ceti b, suggestive of an enhanced probability of bursts near that orbital phase. We model the system’s magnetospheric environment in the context of sub-Alfvénic SPIs and determine that YZ Ceti b can plausibly power the observed flux densities of the radio detections. However, we cannot rule out stellar magnetic activity without a well-characterized rate of non-planet-induced coherent radio bursts on slow rotators.

Hom3r

05-04-2023 15:19

Re: Stephen Hawking warns "we should avoid aliens"

Well life is out there, "The Drake Equation" proves it, around 100,000,000 planets that could support life (that just the Milky Way)

Hugh	05-04-2023 16:02

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by Hom3r (Post 36149327)

Well life is out there, "The Drake Equation" proves it, around 100,000,000 planets that could support life (that just the Milky Way)

But the Fermi Paradox says if that's true, why haven't we seen any?

From Wiki

Quote:

The following are some of the facts and hypotheses that together serve to highlight the apparent contradiction:

There are billions of stars in the Milky Way similar to the Sun.

With high probability, some of these stars have Earth-like planets in a circumstellar habitable zone.

Many of these stars, and hence their planets, are much older than the Sun. If Earth-like planets are typical, some may have developed intelligent life long ago.

Some of these civilizations may have developed interstellar travel, a step humans are investigating now.

Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in a few million years.

Since many of the Sun-like stars are billions of years older than the Sun, the Earth should have already been visited by extraterrestrial civilizations, or at least their probes.

However, there is no convincing evidence that this has happened.

Paul	06-04-2023 13:26

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by Hugh (Post 36149331)

But the Fermi Paradox says if that's true, why haven't we seen any?

From Wiki

How can we be sure we havent.

It says "the Earth should have already been visited by extraterrestrial civilizations" - it could have been, its 4 billion years old, nothing to say they would have visited in the last 200 or so years in which we might have been aware they were aliens.

spiderplant

06-04-2023 13:39

Re: Stephen Hawking warns "we should avoid aliens"

Also, if there are so many Earth-like planets, why would they choose to come to this one?

pip08456

06-04-2023 13:47

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by Hugh (Post 36149331)

But the Fermi Paradox says if that's true, why haven't we seen any?

From Wiki

The problem with the Fermi Paradox is it doesn't define life. Could there be a world where dinosaurs didn't get wiped out and remaind the dominant species? Is an amoeba life? Can silicon life exist?

Quote:

Originally Posted by Paul (Post 36149411)

There's been plenty of speculation they did during the time of the pyramids/Mminoan's

TheDaddy

06-04-2023 14:10

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by Paul (Post 36149411)

Indeed, we may have thought them Gods in older times... :shocked:

Hugh	06-04-2023 16:10

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by pip08456 (Post 36149419)

The problem with the Fermi Paradox is it doesn't define life. Could there be a world where dinosaurs didn't get wiped out and remaind the dominant species? Is an amoeba life? Can silicon life exist?

There's been plenty of speculation they did during the time of the pyramids/Mminoan's

tbf, the Fermi Paradox relates to technological space-faring species (and why haven’t we seen any), and is non-specific on the type of life.

pip08456

06-04-2023 18:14

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by Hugh (Post 36149428)

tbf, the Fermi Paradox relates to technological space-faring species (and why haven’t we seen any), and is non-specific on the type of life.

So it has nothing to do with the presence of life on another planet.

Hugh	06-04-2023 19:00

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by pip08456 (Post 36149430)

So it has nothing to do with the presence of life on another planet.

Well, the technological space-faring race has to come from somewhere…

jfman

06-04-2023 19:10

Re: Stephen Hawking warns "we should avoid aliens"

The Fermi Paradox doesn’t necessarily hypothesise that there isn’t any life out there, it just raises the questions that follow from the apparent absence. Sure, there could be primitive life out there, and there probably has been out there long before us, but what prevented it taking that next step beyond it’s own planet/solar system.

A civilisation like us with even a million year head start, let alone the potential billions of years, “should” leave signs such as a dyson sphere, detectable signs from it’s own environment or span across vast parts of the galaxy. Of course, it could have discovered capitalism, and that the return on investment in a single lifetime, or multiple generations, didn’t warrant the effort.

It is also supplemented by the absence of the von Neumann probe.

It’s all quite fascinating, but irrelevant of course if we are actually in a simulation. ;)

daveeb

06-04-2023 20:11

Re: Stephen Hawking warns "we should avoid aliens"

Quote:

Originally Posted by jfman (Post 36149435)

The Fermi Paradox doesn’t necessarily hypothesise that there isn’t any life out there, it just raises the questions that follow from the apparent absence. Sure, there could be primitive life out there, and there probably has been out there long before us, but what prevented it taking that next step beyond it’s own planet/solar system.

A civilisation like us with even a million year head start, let alone the potential billions of years, “should” leave signs such as a dyson sphere, detectable signs from it’s own environment or span across vast parts of the galaxy. Of course, it could have discovered capitalism, and that the return on investment in a single lifetime, or multiple generations, didn’t warrant the effort.

It is also supplemented by the absence of the von Neumann probe.

It’s all quite fascinating, but irrelevant of course if we are actually in a simulation. ;)

Even if we are in a simulation someone has to be controlling it. And whoever they may or may not be perhaps they're also in a simulation :shocked:

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