However, one must note that being on nationwide television, and exciting, doesn't impute increased likelyhood that the content is good science, perhaps quite the opposite.
I happily admit that me being excited by a TV science program as a very small child does not mean that program was good science.**
But that is not the point I was trying to make.
Beku-mant has been claiming there is some sort of resistance, obstacle or stigma to scientists discussing / investigating the possibility of extraterrestrial life;
When it comes to aliens, something is very different in how we approach it.
The 1977 Royal Institution* Christmas Lectures by Sagan are evidence (there are many, many other examples) that this just isn't so.
(Not sure how relevant Eric Laithwaite's problematic
1974 RI lectures (
The gyroscope, an engineer and the Christmas Lectures) are to this).
The possibility of alien life, and intelligent alien life, was discussed on national TV without being considered bizarre, without attempts to censor or marginalise either the program or its presenter (Sagan). Sagan went on to become more respected and more well-known to the public.
The taxpayer has funded SETI via programs / projects proposed by mainstream academics and approved by government.
There are other examples. Sagan went on to write and host
Cosmos, which also discussed the possibility of ET life and ETI:
External Quote:
The series was first broadcast by the Public Broadcasting Service in 1980, and was the most widely watched series in the history of American public television until The Civil War (1990). As of 2009, it was still the most widely watched PBS series in the world.
Nationally and internationally broadcast, with a huge audience. No censorship. No ridicule. No negative career repercussions.
Efforts are underway to use the James Webb space-based telescope to look for biosignatures from exoplanet atmospheres.
Beku-mant's contention, that there is some form of resistance to discussing hypotheses involving aliens is simply incorrect.
Re. Sagan's 1977 RI lectures,
They talked about radio astronomy based SETI, and things like Dyson spheres, but not SETI in general.
Radio astronomy based SETI is the main part of SETI in general.
Looking for things you cannot immediately identify with a small telescope or binos is not generally considered a contribution to SETI, it is UFO-hunting. There is
no evidence that there is any connection between sightings/ claims of UFOs and extraterrestrial life.
The connection exists in the beliefs of UFO enthusiasts.
In fairness,
@beku-mant is right, there isn't much discussion of SETI per se in the episode I was thinking about (episode 6, Planetary Systems Beyond our Sun),
but there very clearly is discussion of hypothetical extraterrestrial intelligence in a sympathetic, non-critical manner, by a mainstream (and increasingly respected) astronomer. There is discussion relating to CETI (communication with ETI) which presupposes that SETI might be successful. Sagan had been invited to talk by one of the oldest (and arguably "mainstream") science societies in the world. The talks were broadcast across the UK on nationwide TV. There was no backlash. No censorship. No ridicule.
Source: https://www.youtube.com/watch?v=X__kbLv25uU&t=1228s
Professional scientists (and engineers) are usually fairly bright people who have received an extended education. The successful ones know how to test hypotheses and assess the results. Their methods are replicable, their conclusions testable (and if correct, repeatable).
It is indisputable that there are scientists and engineers involved in SETI, and they are not professionally hampered or censored.
Use of the James Webb telescope (or the Arecibo dish back in the day) isn't something done covertly during a lunch break.
"We keep blocking them" smacks of pure conspiracy theory.
Agreed.
Obviously the possibility an ETI could have already sent probes here has been, and still is, very heavily stigmatized
By whom? And why is it obvious?
The idea that UFO sightings have anything to do with ETI probes
is arguably stigmatised, mainly by the actions and beliefs of UFO enthusiasts who seem (I'm generalising) more interested in collecting- and believing- ever greater numbers of anecdotes and shoddy claims of "evidence" than testing the hypothesis that UFOs are ETI artefacts. They want to believe, not know.
The Fermi paradox (1950) holds it as axiomatic that interstellar travel is possible, and that ETI civilisations would embark on it. Fermi's reputation as a scientist was not harmed.
If many scientists involved in SETI do not think that UFO hunting is a productive activity in the search for extraterrestrial intelligence, maybe they're right.
Maybe they've not been intimidated, censored, railroaded or brainwashed; maybe the highly qualified, bright people who spend a portion of their working lives on SETI disagree with UFO enthusiasts for perfectly rational, honestly-held and respectable reasons.
In
post #218 @beku-mant quotes American theoretical physicist Sean Carroll;
External Quote:
We've looked for intelligent life, but we've looked in the dumbest way we can, by turning radio telescopes to the sky, and why in the world would a super advanced civilization randomly beam radio signals .. that doesn't make any sense ... if you though that there were other solar systems with with planets around them, where maybe intelligent life didn't yet exist but might someday, you wouldn't try to talk to it with radio waves, you would send a spacecraft there, and you would park it.
I suspect many scientists involved in SETI (and Carroll is not, and never has been AFAIK) would state that using radio telescopes to listen for signals is probably our best bet at present. They probably would not consider themselves as doing something "dumb".
Studying UFO sightings is not a rational alternative, unless you believe randy red-headed spacewomen seducing Brazilian tractor drivers tells us something about life elsewhere in the universe (it might tell us something about life on Earth), or that if we watch enough phone cam footage of airliners over New Jersey, late 2024, we will eventually find unambiguous footage of an exotic flying vehicle.
Carroll:
External Quote:
...why in the world would a super advanced civilization randomly beam radio signals...
(1) No-one's expecting ETI to "randomly" beam radio signals. That would be wasteful, and irrational. If ETI are interested in contacting other intelligent species, they would presumably put some thought into where they would aim their signal, and choose promising candidate systems.
(2) It's relatively cheap. If there are intelligences out there listening, it could be effective.
We are listening. Of all the technological species ever known to have existed, 100% are listening for radio messages from other intelligences.
(3) As well as being cheap, it is a technology that might be available to technological societies from relatively early on (if we are anything to go by). Ergo, if the intention is to contact other civilisations, radio messages would be receivable by the widest range of technological societies- newbies as well as seniors.
Carroll:
External Quote:
...if you though that there were other solar systems with with planets around them, where maybe intelligent life didn't yet exist but might someday, you wouldn't try to talk to it with radio waves, you would send a spacecraft there, and you would park it.
While we cannot know the capabilities of technologies in advance of our own, Sean Carroll might be being a
bit optimistic about the abilities of a complex functioning artefact to continue in operation for (presumably) millions of years. It would require a considerable attention span (and societal stability) on the part of ETI.
Delivery of a functioning craft across interstellar distances would presumably be very expensive.
Radio communication is cheap, and easy to repeat.
How many radio signals could be sent, frequencies listened to, in the
millions of years while you're waiting for your space probe -if it has survived- to detect the possible evolution of intelligent life? At what miniscule fraction of the cost?
It might be rare for intelligence to arise, even on planets with life (let's assume an ETI has the capability to detect biosignatures in exoplanet atmospheres; we're probably close to that capability). So the ETI might have to send out many very expensive interstellar probes.
And then maybe wait for millions of years. Somehow, using radio telescopes for SETI doesn't seem quite as dumb as Carroll said.
Re. his hypothetical interstellar probe, Carroll says "park it"; he is not suggesting that such a craft would do occasional flits, from its orbital anonymity, to Mount Rainier, Washington D.C. or Pascagoula (using who only knows what propulsion to get back into space).
But it is a tenet of UFO enthusiasts- or at least those who advocate looking for UFOs as some form of SETI- that this is
exactly what is happening, and it happens on a regular basis.
And after millions of years waiting for a technological society to arise, the alien craft has a particular interest in lumberjacks, blokes out fishing, an embankment in Council Bluffs and a pair of F/A-18s (which, while formidable by our standards, are by no means the most capable or advanced combat aircraft in general service, and arguably never were).
It would have to be able to communicate its findings back to its originators: By radio? Lasers have been mooted as a possible communication system, but the power required might be prohibitive for a modest, million-year old space probe.
The United States now tracks all objects down to approx. 10cm/ 4 inches in size in near Earth orbit:
External Quote:
This series of visualizations illustrates the population of objects orbiting Earth as of February 2024. The data comes from United States Space Command (USSPACECOM), via space-track.org, which maintains a publicly available catalog of trackable objects in space. These include active satellites, defunct spacecraft, rocket bodies, and debris fragments larger than roughly 10 cm in low Earth orbit.
NASA, "Tracking Satellites and Space Debris in Earth Orbit (Feb 2024)", 16 June 2025
https://svs.gsfc.nasa.gov/5258
It is likely this coverage will be significantly extended in the near future,
External Quote:
A powerful new radar system designed to detect and track objects in distant orbits above Earth has passed a key initial test.
The "Deep Space Advanced Radar Capability," or DARC, is a multi-site radar system being developed by the U.S. Space Force and its counterparts in the United Kingdom and Australia. Once complete, the system will consist of three separate sites spread out around the globe that will allow these three nations, who make up the the AUKUS security partnership, to keep tabs on what's happening in geosynchronous orbit (GEO), which is found around 22,000 miles (35,500 km) above Earth.
"US Space Force's new deep space radar tracks multiple satellites 22,000 miles away in key test", Space.com website, Brett Tingley 14 August 2025
https://www.space.com/technology/us...iple-satellites-22-000-miles-away-in-key-test
Needless to say, there hasn't been a detection of a possible ETI artefact.
Unless there's been a cover-up.
Another possibility is that the alien craft in orbit, L1 or wherever is stealthed to avoid detection by space-tracking radar (and presumably ballistic missile early warning systems during its forays Earthside), but is strangely observable to UFO fans during its frequent visits.
While it is not meant to be observed, through some design oversight by the ETI, it is more visible than e.g. a contemporary human military reconnaissance drone is to people on the ground.
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* Royal
Institution, Wikipedia
https://en.wikipedia.org/wiki/Royal_Institution, see also
https://www.rigb.org/explore-science/explore/video/planets-planetary-systems-beyond-our-sun-1977.
In earlier posts I had carelessly written "Royal
Society", which is incorrect.
** I'm not aware of any serious criticism of the content of Carl Sagan's Royal Institution 1977 Christmas Lectures.
I was under the impression that they were very well-received, perhaps anyone knowing otherwise can PM me.
They were aimed primarily at children and young people, as all RI Christmas Lectures in recent decades have been. The aim of the lectures is to educate and to popularise science.