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Posts Tagged ‘extraterrestrial life

“A time will come when men will stretch out their eyes. They should see planets like our Earth.”*…

Not long ago the search for extraterrestrials was considered laughable nonsense. Today, as Adam Frank explains, it’s serious and scientific…

Suddenly, everyone is talking about aliens. After decades on the cultural margins, the question of life in the Universe beyond Earth is having its day in the sun. The next big multibillion-dollar space telescope (the successor to the James Webb) will be tuned to search for signatures of alien life on alien planets and NASA has a robust, well-funded programme in astrobiology. Meanwhile, from breathless newspaper articles about unexplained navy pilot sightings to United States congressional testimony with wild claims of government programmes hiding crashed saucers, UFOs and UAPs (unidentified anomalous phenomena) seem to be making their own journey from the fringes.

What are we to make of these twin movements, the scientific search for life on one hand, and the endlessly murky waters of UFO/UAP claims on the other? Looking at history shows that these two very different approaches to the question of extraterrestrial life are, in fact, linked, but not in a good way. For decades, scientists wanting to think seriously about life in the Universe faced what’s been called the ‘giggle factor’, which was directly related to UFOs and their culture. More than once, the giggle factor came close to killing off the field known as SETI (the search for extraterrestrial intelligence). Now, with new discoveries and new technologies making astrobiology a mainstream frontier of astrophysics, understanding this history has become important for anyone trying to understand what comes next. But for me, as a researcher in the field of technosignatures (signs of advanced alien tech) – the new face of SETI – getting past the giggle factor poses an existential challenge.

I am the principal investigator of NASA’s first ever grant to study signatures of intelligent life from distant exoplanets. My colleagues and I are tasked with developing a library of technosignatures or evidence of technology-wielding life forms on distant planets. Taking on that role has been the culmination of a lifetime fascination with the question of life and the Universe, a fascination that formed when I was a kid in the 1970s, drinking deep from the well of science fiction novels, UFO documentaries and Star Trek reruns. Early on, as a teenager reading both Carl Sagan and Erich von Däniken (the author of Chariots of the Gods), I had to figure out how to separate the wheat from the chaff. This served as a kind of training ground for dealing with questions facing me and my colleagues about proper standards of evidence in astrobiology. It’s also why, as a public-facing scientist, I must work to understand how people not trained in science come to questions surrounding UFOs as aliens. That is what drove me, writing a recent popular-level account of astrobiology’s frontiers called The Little Book of Aliens (2023), to stare hard into the entangled history of UFOs, the scientific search for life beyond Earth, and the all-important question of standards of evidence…

[Frank explains the efforts underway, their history, and the rigor being applied in sifting for credible evidence…]

… With the giggle factor receding for the scientific search for life, where does that leave UFOs and UAPs? There, the waters remain muddied. It is a good thing that pilots feel they can report sightings without fear of reprisal as a matter of air safety and national defence. And an open, transparent and agnostic investigation of UAPs could offer a masterclass in how science goes about its business of knowing rather than just believing. In The Little Book of Aliens, I even explained how such an investigation might be conducted (the recent NASA UAP panel and the Galileo Project are exploring these kinds of options). But if my colleagues and I claimed we’d found life on another world, we’d be required to provide evidence that meets the highest scientific standards. While we should let future studies lead us where they may, there is simply no such evidence surrounding UFOs and UAPs that meets these standards today. In fact, at a recent hearing conducted by NASA’s UAP panel, it was revealed that government studies show only a small percentage of reported sightings failed to find a reasonable explanation. Many of the remaining cases did not have enough data to even begin an attempt at identification. The sky is simply not awash in unexplained phenomena.

In the end, what matters is that, after thousands of years of arguing over opinions about life in the Universe, our collective scientific efforts have taken us to the point where we can finally begin a true scientific study of the question. The next big space telescope NASA is planning will be called the Habitable Worlds Observatory. The name tells you all you need to know. We’re going all in on the search for life in the Universe because we finally have the capabilities to search for life in the Universe. The giggle factor is finally history.

How UFOs almost killed the search for life in the universe: “Alien life is no joke,” from @AdamFrank4 in @aeonmag.

See also: this report on two studies that suggest we may have found evidence of Dyson Spheres—and alien civilizations

For more on a related field, see Astrobiology (@carnegiescience)

Also apposite (and typically for him, both informative and very amusing): John Oliver on UFOs

* the foresightful Christopher Wren

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As we look up, we might recall that it was on this date in 1930 that Pluto was announced to be the name chosen for the newly-discovered ninth planet (previously known as Planet X) by Roger Lowell Putnam, trustee of Lowell Observatory, Flagstaff, Arizona, (and nephew of the late Percival Lowell who had established the observatory and initiated the search there for the ninth planet). Pluto had been located there on in February of that year at that institution by Clyde Tombaugh.

Putnam was quoted on the front page of the New York Times, saying, “We felt in making our choice of a name for Planet X, that the line of Roman gods for whom the other planets are named should not be broken, and we believe that Dr. Lowell, whose researches led directly to its discovery, would have felt the same way.” Pluto in mythology was the ruler of the underworld, regions of darkness. “P.L.” is also Lowell’s monogram.

While it’s still known as Pluto, in 2006 the International Astrophysical Union demoted it from a “planet” to a “dwarf planet.”

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“It is unnatural in a large field to have only one shaft of wheat, and in the infinite Universe only one living world”*…

One indication of advanced alien life could be industrial pollution. Therefore, the presence of gases such as nitrogen dioxide might serve as a technosignature that we could detect on exoplanets. (Courtesy: NASA/Jay Freidlander) [source]

NASA’s top scientists have a provocative message for the scientific community: that they need a plan in place for if — or when — we find evidence of extraterrestrial life…

James Green, the agency’s chief scientist, coauthored a new article, published in the journal Nature, urging researchers to create a framework for reporting evidence of aliens. In it, the authors stressed the importance of clearly communicating any findings of extraterrestrial life, as well as establishing clear expectations for the public for when it occurs and accurately expressing ambiguity in early evidence.

“As life-detection objectives become increasingly prominent in space sciences, it is essential to open a community dialogue about how to convey information in a subject matter that is diverse, complicated and has a high potential to be sensationalized,” read the paper.

Green and his co-authors propose a confidence of life detection (CoLD) scale to help evaluate any evidence that might be discovered. The scale itself contains seven different levels like a staircase. Each level is a benchmark that must be met before we can proceed to the next step. 

For example, level one would be discovering life signatures such as biological molecules. The second level would be ruling out that the sign of life is the result of contamination from Earth. Eventually, the CoLD scale ends with the final step: scientists declaring that they’ve confidently discovered evidence of extraterrestrial life. 

“Having a scale like this will help us understand where we are in terms of the search for life in particular locations, and in terms of the capabilities of missions and technologies that help us in that quest,” Green said in a NASA news release

The paper’s authors stress that the scale is merely a starting point for a larger conversation with scientists and science communicators about the best ways to proceed if and when we discover evidence of alien life. 

It also comes in the context of the upcoming launch of the powerful James Webb telescope, along with the Perseverance Mars rover searching for life on the Red Planet, meaning that such a finding might become a reality sooner rather than later. 

“The search for life beyond Earth requires broad participation from the scientific community and many kinds of observations and experiments,” Mary Voltek, co-author of the study and head of NASA’s Astrobiology Program, said in the release. “Together, we can be stronger in our efforts to look for hints that we are not alone.”

NASA Says We Need a Plan for When We Discover Alien Life,” from @futurism.

As to what we’ll do with that knowledge, a complicating factor: “94% of the universe’s galaxies are permanently beyond our reach” (if the speed of light remains an upper limit on travel).

Metrodorus of Chios

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As we search far and wide, we might send enduring birthday greetings to Sir Hermann Bondi; he was born on this date in 1919. A mathematician and cosmologist, he is best remembered for developing the steady state model of the universe with Fred Hoyle and Thomas Gold as an alternative to the Big Bang theory. In an attempt to explain the paradox: how can the stars continually recede, yet without disappearing, they audaciously proposed an unproven hypothesis: that the universe has an eternal existence, with no beginning and without an end. Further, they argued, the universe is continuously expanding, maintaining a constant density by continually creating new matter from energy. Their model was rendered obsolete when, in 1965, Arno Penzias and Robert Wilson detected a background microwave radiation from all directions in space, as predicted by the “Big Bang” theory of creation that is now accepted. [See here for more on Penzias’ and Wilson’s discovery.)

Bondi also contributed to the theory of general relativity; was the first to analyze the inertial and gravitational interaction of negative mass; and the first to explicate correctly the nature of gravitational waves.

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