Carl Sagan war ein außergewöhnlicher Wissenschaftler und Wissenschaftskommunikator

Carl Sagan
US-amerikanischer Astronom, Astrophysiker,
Exobiologe, Fernsehmoderator, Sachbuchautor und Schriftsteller.

#CarlSagan
#Seti
#Weltraum
#Wissenschaft

When it's going to be starry night, my gear is always ready.
From left to right:
#Unistellar #eVscope
and #Odyssey
Pro top of pole 4x #Tapo #C325WB
#astronomy #citizenscience #space #telescope #seti #skymapper

Cereal Box-Sized Satellite Shares First Images of Stars While Searching for Life on Exoplanets. Via @discover.magazine #Space #Astrophysics #OrbitalMechanics #Astronomy #SETI 🚀 🌌 ☄️ 🛰️

UK Filmmaker Retracts Trump UAP Speech Claim as Berlin Airspace Halt and SETI Study Shift Focus to Data-Driven Inquiry Cristina Gomez reports that UK filmmaker Mark Christopher Lee has walked back his claim that a Washington insider confirmed a scheduled UAP disclosure speech by former President Donald Trump, saying he was likely used to spread disinformation. She also covers a brief flight halt at Berlin Brandenburg Airport following a luminous aerial sighting and highlights new SETI research indicating space weather may have obscured potential extraterrestrial signals, alongside AI-driven advances in the search.

UK filmmaker retracts claim of a scheduled Trump UAP disclosure as likely disinformation; Berlin briefly halted flights after a luminous sighting. SETI says space weather may have masked signals while AI is sharpening the search. #UAP #SETI #AI

SETI thinks we might have missed messages from aliens They think the focus was too narrow to account for the possible disturbances that exist out there. Humanity has been scanning the cosmos for de...

#FYI #News #SETI #Institute

Origin | Interest | Match

Could Messages from Extraterrestrials “Slip Below Our Detection Thresholds”? A New Study Explains Why We’re Missing Alien Signals SETI researchers may have missed alien signals due to a cosmi...

#Astronomy #Breaking #News #SETI #Advanced #civilizations #alien […]

[Original post on thedebrief.org]

A Primer on SETI at the SETI Institute

From its NASA-rooted origins and private philanthropy sustaining it after funding cuts, the SETI Institute—founded by Tom Pierson and Jill Tarter—pursues a passive radio and optical search for intelligent life, focusing on the water… #aliens #australia #ovni #puertorico #seti #uap #ufo #ufosky #usa

A row of dish-type radio antennas, at dusk.

So far, astronomers haven't found any confirmed #alien radio signals. Why not? Researchers at the #SETI Institute in California said that space weather from our sun and other stars might distort artificial signals to become unrecognizable. 👽📡🔭
buff.ly/lItiBSI

📸 Alex Savello/ NRAO/ SETI Institute.

Protocols for an ETI Signal Detection

Led by the Carl Sagan Center for Research, a multidisciplinary program spans astrobiology, astronomy and astrophysics, data science, exoplanets, heliophysics, planetary exploration, and SETI, conducts diverse projects such as SETI at t… #aliens #arecibo #newmexico #ovni #seti #uap #ufo #ufosky #usa

Where are all the aliens? Maybe space weather is scrambling their transmissions "If a signal gets broadened by its own star's environment, it can slip below our detection thresholds, even if it's there."

www.space.com/space-explor...

#SETI #extraterrestrial #ExtraterrestrialLife #spaceexploration

Meine erste Runde #Seti und ich hasse es. 🤬

4 Stunden spielen und ein Frustmoment nach dem anderen. Furchtbar. Bin genervt bus zum Saturn

@brettspiele #Brettspiele

Broadband SETI: A New Strategy To Find Nearby Alien Civilizations - Astrobiology One of the most interesting questions that astronomy can hope to answer is: are we alone in our Milky Way galaxy

Broadband SETI: A New Strategy To Find Nearby Alien Civilizations
astrobiology.com/2026/03/broa... #astrobiology #SETI

No signs of technology on exoplanet K2-18 b An artist's rendering of K2-18 b, a potentially habitable exoplanet located 124 light-years from Earth. Credit: Arndt Stelter, CC BY 4.0, via Wikimedia Commons The latest search for life on the headline–making exoplanet K2-18 b has come up empty. But the team says that they have developed a framework that could shape how scientists hunt for extraterrestrial life for years to come. In a study posted to the arXiv preprint server and accepted for publication by _The Astrophysical Journal_ , researchers conducted one of the broadest and most sensitive technosignature searches ever in the K2-18 planetary system. Technosignatures are observable signs of technology that could indicate the presence of intelligent life. Using the Very Large Array (VLA) in New Mexico and the MeerKAT radio telescope in South Africa, the team observed the K2-18 system for 33 days, the length of a year on the planet K2-18 b. After filtering out radio frequency interference (RFI) and other noise, they found no radio signals consistent with a technological origin. ## Our hycean neighbor The exoplanet K2-18 b is a sub-Neptune — a planet smaller than Neptune but larger than Earth — and for the past few years, a group of researchers led by Nikku Madhusudhan at the University of Cambridge has floated it as a prime candidate for habitability. Located 124 light-years from Earth, K2-18 b orbits within the habitable zone of its namesake host star: the red dwarf K2-18. Recent analyses of the exoplanet’s atmosphere by the James Webb Space Telescope (JWST) have revealed both methane and carbon dioxide in a hydrogen-rich atmosphere. This, the team has proposed, is consistent with what they call a hycean world: a hypothetical class of habitable planet with a thick hydrogen atmosphere overlying a liquid ocean. Follow-up work from this team suggested the atmosphere of K2-18 b may contain a signal of dimethyl sulfide that they consider to be a potential biosignature — though this interpretation has been heavily disputed by other researchers. Because K2-18 b is one of the most enticing places to search for extraterrestrial life, scientists have broadened the search to include radio technosignatures. This approach operates under the assumption that if there’s advanced civilizations out there, they might communicate just like we do — and we might be able to detect those communications. ## The hunt begins If any civilization wishes to make its presence known across the cosmos, narrowband radio signals are an ideal form of beacon. This idea dates back to a foundational 1959 paper by Giuseppe Cocconi and Philip Morrison that launched the modern search for extraterrestrial intelligence (SETI). Nature doesn’t tend to produce narrowband signals — stars and galaxies generally emit across broad swaths of the spectrum. But most of Earth’s own detectable radio leakage, for example, consists of narrowband signals from powerful radio systems like the Deep Space Network. The team used the VLA and MeerKAT to hunt for narrowband radio signals coming from the K2-18 system. The VLA observations were conducted over multiple days between Sept. 29 and Dec. 21, 2023, and MeerKAT observed the system across three sessions in late September and early October 2023. Together, the observations covered at least one full orbital period of K2-18 b, which takes about 33 days to circle its star. The search spanned frequencies from 544 MHz to 9.8 GHz — a significantly broader range than previous technosignature searches of K2-18 b, and at sensitivities capable of detecting transmitters up to a thousand times weaker. After processing millions of detected signals — over 20 million from VLA alone — the team found no transmissions consistent with a technological origin. While a null result isn’t the most exciting find, what may prove more significant is the methodology they developed to cut through the noise and identify artificial signals — a framework that can now be used for other hycean worlds. ## A new methodology After masking out known sources of interference, eliminating machine noise, and cutting signals that were too strong or too weak to be genuine detections, the team applied a series of filters to narrow down the list of candidate signals to only legitimate technosignatures. First, they used the telescopes’ multiple beams to check whether a signal was coming specifically from the direction of K2-18 b or showing up all across the sky. For MeerKAT, that single step eliminated every remaining signal. For the VLA, roughly 14,600 signals survived and were subjected to further filtering. Because K2-18 b is moving through space, any signal originating from the planet would experience a Doppler shift as it travels to Earth — similar to how light from distant galaxies is redshifted as they move away from us. Signals that didn’t match the drift rate expected from K2-18 b were thrown out, along with any signals with a drift rate of zero, which are almost certainly terrestrial in origin. The team also checked whether signals persisted when the planet passed behind its host star — a genuine technosignature from the planet’s surface couldn’t reach Earth during that window. And since K2-18 b is orbiting its star, a real signal should shift in frequency and drift rate over time, so any signal that remained unchanged across multiple observing days was eliminated. Finally, surviving candidates were visually inspected. This search does not definitively prove that there is no life on K2-18 b or even that there is no technology. As the paper points out, “This result is consistent with several possibilities: K2–18 b may be uninhabited, it may host pre-technological life, or any technologically capable civilization may employ communication modalities that are not detectable with our current observing strategy (e.g., non-radio, broadband, low-duty cycle, or highly encrypted signals).” Ultimately, the methodology the team built doesn’t just apply to K2-18 b — it can be used on any exoplanet that looks like a good candidate for habitability. As bigger and more powerful telescopes come online in the coming years – like the Square Kilometer Array (SKA) and the next generation Very Large Array (ngVLA), that framework will only become more valuable. K2-18 b may not have answered the question of whether we’re alone, but it is helping scientists figure out how to ask it better.

No signs of technology on exoplanet K2-18 b The latest search for life on the headline–making exoplanet K2-18 b has come up empty. But the team says that they have developed a framework that coul...

#Exoplanets #News #SETI

Origin | Interest | Match

Hot news!

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SETI's blind spot: how stellar weather may be hiding alien signals SETI researchers discover space weather distorts radio signals from alien civilisations, potentially explaining the lack of detected transmissions.

SETI's blind spot: how stellar weather may be hiding alien signals

#SETI #AlienLife #SpaceWeather #Astronomy #AusNews

thedailyperspective.org/article/2026-03-10-setis...

@angryastro

Is there any evidence...at all...that #Alien 👽 transmissions have ever reached Earth?
Thanks to #SETI @home we've detected far more than the WOW Signal!
There are 92 new candidates!
https://youtu.be/9w_rJeJPDxw

@bipisci.bsky.social
#Moon #Conspiracy #BigPictureScience #SETI #News #Podcast #Science

Aliens may have been trying to contact humans for years - and we had no idea It's keeping our hunt for little green men 'one-sided', an expert told Metro.

Aliens may have been trying to contact humans for years - and we had no idea. Via @metro.co.uk #Space #Astrophysics #OrbitalMechanics #Astronomy #SETI 🚀 🌌 ☄️ 🛰️

Why SETI Might Have Been Missing Alien Signals Turbulent plasma near distant stars could blur ultra-narrow signals before they leave their home star systems, making them difficult to detect.

Why #SETI Might Have Been Missing #Alien Signals

www.seti.org/news/why-set...

This is really cool! #SETI #technosignatures

Where are all the aliens? Maybe space weather is scrambling their transmissions "If a signal gets broadened by its own star's environment, it can slip below our detection thresholds, even if it's there."

You humans keep looking for radio signals, but nobody outside your silly species still uses those.

Where are all the aliens? Maybe space weather is scrambling their transmissions. Via @spacedotcom #Space #Astrophysics #OrbitalMechanics #Astronomy #SETI 🚀 🌌 ☄️ 🛰️

Exo–IPM Scattering as a Hidden Gatekeeper of Narrowband Technosignatures Exo–IPM Scattering as a Hidden Gatekeeper of Narrowband Technosignatures, Gajjar, Vishal, Brown, Grayce C.

Space weather might be drowning out possible ET radio signals.
#SETI

iopscience.iop.org/article/10.3...

Stormy space weather may be garbling messages from aliens, new research suggests Researchers who listen for signs of non-human life say signals ‘can slip below detection thresholds, even if it’s there’

Stormy space weather may be garbling messages from aliens, new research suggests. Via @guardian #Space #Astrophysics #OrbitalMechanics #Astronomy #SETI 🚀 🌌 ☄️ 🛰️

SETI Analyses Flag 92 Radio Candidates and Three Laser-Like Optical Anomalies, Prompting Rethink of Search Strategies The Angry Astronaut reviews new technosignature research, highlighting 92 radio candidates from the SETI@home archive and three tiered optical anomalies identified in ESO HARPS data. The presentation also examines evidence that stellar plasma turbulence could smear narrowband transmissions, potentially masking genuine extraterrestrial signals and motivating broader search methods.

New SETI analyses surface 92 radio candidates and three laser-like optical anomalies - plus evidence stellar plasma turbulence could smear narrowband transmissions. Results push for broader technosignature search strategies. #SETI #technosignatures #astronomy

How Long Do Civilisations Last? In 1950, the physicist Enrico Fermi sat down to lunch with colleagues and asked a question that has haunted astronomers ever since. If the universe is so vast, so old, and so full of stars, where is e...

www.universetoday.com/articles/how...

#extraterrestrial #civilization #spaceexploration #SETI

A calico cat crouches next to a game of SETI, arranged on a gaming table with a blue lining.

Performing her mandatory #FridayNightBoardgame inspection 😺

#RogueTheCat #CatsofBluesky #Boardgames #SETI

Why SETI Might Have Been Missing Alien Signals Turbulent plasma near distant stars could blur ultra-narrow signals before they leave their home star systems, making them difficult to detect.

A new analysis shows that space weather from turbulent stellar winds and eruptions broadens ultra-narrow radio signals as they travel, lowering peak strength and spreading power across frequencies so that traditional razor-thin spectral searches may miss trans… #aliens #ovni #seti #uap #ufo #ufosky

5-Mar-2026
Why #SETI might have been missing alien signals
Turbulent plasma near distant stars could blur ultra-narrow signals before they leave their home star systems, making them difficult to detect.

#science #astrobiology #ET #space

Why SETI Might Have Been Missing Alien Signals - Astrobiology A new study by researchers at the SETI Institute suggests stellar “space weather” could make radio signals

Why SETI Might Have Been Missing Alien Signals
astrobiology.com/2026/03/why-... #astrobiology #SETI #Technosignature

The board design captures the cold, vast beauty of the cosmos. It’s clean, functional, and looks stunning on the table. A visual masterpiece. 🌌🔭 @CzechGames #SETI #GraphicDesign #BoardGames