Avi Loeb is the Baird Professor of Science at Harvard University, Director of the Galileo Project, and Chair of the UAP Science Advisory Council @uapsac. No DMs

If we do have visitors, say we find an alien probe, it's similar to a cave dweller that finds a cell phone and at first thinks it's just another rock, but eventually presses buttons and realizes it's something else. It delivers a sense of humility. It delivers the message that we are not at the top of the cosmic food chain. We will have to come together and deal with this visitor. Instead of investing three trillion dollars a year in military budgets, we might decide to allocate a major fraction of that to space exploration. To me, it's a silver bullet that could bring peace to the world.
72
74
386
13,332
The biggest risk that I see is the effect that AI will have on humans. The only way for us to accomplish planetary peace is by recognizing the humanity in each of us. But what you see with AI is that people get addicted to digital screens and lose the connection with other people. Young kids are getting emotionally connected to AI bots and spend less time with real people. When you spend less time with people, you lose part of your humanity. What AI is doing is robbing us from our humanity. That's the biggest risk.
38
50
180
6,107
My solution for planetary peace is to recognize that our planet is one out of billions of Earth-Sun analogs in the Milky Way galaxy alone. We should operate with a bigger perspective of cosmic modesty. One major reason for all the wars and the problems we face is the arrogance of humans to believe that it really matters if we conquer a piece of land. If there was an alien visit by a technological probe, it will wake us up — and we would realize that we could actually become an interstellar species, not limited to the place we were born on.
95
134
687
20,298
Here are my insights from the sixth tranche of archival data on Unidentified Anomalous Phenomena (UAP) released by the U.S. Department of War on behalf of the Presidential Unsealing and Reporting System for UAP Encounters.
41
63
356
15,359
With today’s sixth PURSUE UAP tranche release, we are also hoping that the volume of available data will continue to increase considerably, thanks to the memo issued by the Principal Deputy Director of National Intelligence, Aaron Lukas (@DepDNILukas). I applaud the leadership of Aaron Lukas and everyone working to make full UAP disclosure possible. The UAP Science Advisory Council (@UAPSAC) is ready to work with whistleblowers and government partners to independently evaluate the evidence and help verify the science wherever the data leads.
72
92
393
10,861
I attended a meeting of the UAP Governance Board on September 11, 2026 at the ODNI. That ODNI room was filled with honorable representatives from all branches of the executive branch of the U.S. government. The mood was sober and serious, following the deep interest in UAP from the White House. In my short presentation I clarified that President Trump’s directive to understand UAP would reverberate for millions of years in case it will seed a new understanding of our cosmic neighborhood. In my role as chair of the UAP Science Advisory Council to the White House, ODNI, the Department of War, the FBI, and the Intelligence Community, I felt more at home in the company of government officials than among comet experts in mainstream academia. Thanks to the historical waiver of legal repercussions to UAP whistleblowers issued by the Principal Deputy Director of National Intelligence, Aaron Lucas (@DepDNILukas), we are likely to learn more about history data collected by the U.S. government on UAP over the past century. What started as a down-to-Earth matter may end up reaching the stars. Eventually, the mainstream of academia will catch up but rather than wait for their awakening, I will be working around the clock to bring scientific clarity on UAP through the collection and analysis of new data.
79
135
684
30,394
On behalf of the UAP Science Advisory Council (@UAPSAC), I would like to thank Deputy Director of National Intelligence @DepDNILukas and ODNI for their support and hospitality as we collaborate on resolving the nature of Unidentified Anomalous Phenomena. It is a great privilege and pleasure to work with them. - Avi Loeb
I'd like to thank Professor Avi Loeb and the UAP Science Advisory Council, as well as the Disclosure Foundation and To The Stars representatives, for joining us recently at @ODNIgov in their capacity as advisors to the intelligence community's UAP Governance Board. Your insights and feedback into @POTUS's historic disclosure effort are appreciated and the American people are fortunate to have such expert counsel. We look forward to continued collaboration on PURSUE objectives. #UAP
28
34
246
9,118
This is an important step forward, and I applaud Aaron Lukas (@DepDNILukas) and everyone working to make it possible. The UAP Science Advisory Council (@UAPSAC) is ready to work with whistleblowers and government partners to independently evaluate the evidence and help verify the science wherever the data leads.
The @DeptofWar and the Intelligence Community are working closely together to ensure historic @POTUS disclosure directives on #UAP are implemented with seriousness and at speed. This waiver process is a critical component of the strategy.
23
51
315
11,006
Defining a New Research Frontier on the “Search for Extraterrestrial Artificial Intelligence" (SETAI) Last week was a code-red moment for artificial intelligence (AI), in which AI researchers voiced fresh fears of human extinction. The 27-year-old AI researcher Jacob Coxon, who previously worked at OpenAI and later moved to Anthropic, resigned from his job on September 9, 2026 and stated that AI researchers were genuinely frightened about the speed of its advancements and what it could mean for the future of humanity. He posted a seven-part thread on X announcing it: “I resigned from Anthropic today… Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives.” An Alignment Science Lead at Anthropic, Evan Hubinger, publicly agreed with him. A few days later, on September 12, 2026, Anthropic head Dario Amodei, posted an essay titled “We Must Pace the Frontier,” in which he argued for AI development to slow down, and suggested embedding evaluators in AI companies and establishing a speed limit on self-improvement of AI systems. If a civilization’s own AI eventually surpasses and effectively supersedes its biological creators, whether through extinction, disempowerment, or simply a transition where AI becomes the dominant strategist of that civilization, this might provide the Great Filter that explains the radio-communication silence of the cosmos. Instead, the messengers could appear in the form of Unidentified Anomalous Phenomena (UAP) near Earth, like the mysterious orbs flagged in the tranches of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE) of the U.S. government, that the Galileo Project (GP), the All-Domain Anomaly Resolution Office (AARO) and the UAP Science Advisory Council (@UAPSAC) are attempting to resolve.
48
68
304
19,495
Professor Avi Loeb retweeted
Great insight from @ProfAviLoeb regarding open mindedness of the "other worldly interpretation" of UAP. Generally we see academia lead the way on discovery topics of a certain nature and not government. avi-loeb.medium.com/make-his…
6
28
2,415
The most mysterious unidentified anomalous phenomena in the five tranches of data are orbs. These orbs are glowing entities estimated to be on the order of meters in size. The encounters are diverse. The second tranche mentions a senior intelligence officer's 2025 account of being left virtually speechless after an hour-long observation of orange orbs. The fifth tranche provides a helicopter account of an orb swarm with a series of close UAP encounters lasting over an hour. Some orbs are consistent with earlier historical reports on Tic-Tac-shape object.
111
149
891
50,992
Was Dark Matter Detected? A new analysis of data from the LUX-ZEPLIN (LZ) experiment has recorded a single particle interaction that cannot be explained in terms of known background signals. The result does not meet the statistical threshold required to claim a discovery, but is the most compelling hint of dark matter reported to date.
22
24
155
5,238
I am delighted to partner with @AdamWeitsman on a new Galileo Observatory at Carl Sagan’s former residence in Ithaca. The observatory will search the entire sky for UAP using infrared, visible, radio and audio sensors, while making its data available to the public.
Digital Art Museum/Project Galileo located at the previous Carl Sagan property on the gorge adjacent to Cornell University in Ithaca NY. I am partnering with famed Harvard University Astrophysicist Avi Loeb, to install a next generation, high power telescope to help us discover UFO’s (UAP’s) and to share our findings with the world ……. @ProfAviLoeb @Harvard @carlsagandotcom @Cornell
17
22
136
5,366
Professor Avi Loeb retweeted
Re both the possibilities of non-Earth-life in the Solar System, and that some-UFOs-are-aliens, reasonable priors are pretty high. So Bayesian analysis does NOT recommend treating these as "extraordinary" hypotheses demanding very strong evidence. overcomingbias.com/p/aliens-…
20
18
132
14,591
Some Alien Space Travel Could Leave a Signal We Can Detect. In a new paper with my brilliant former postdoc, James Guillochon, shows that leakage from a light sail propulsion apparatus in operation around a solar system analog would produce a detectable signal. For cargo transportation across planetary systems, we found the optimal beam frequency to be on the order of tens of gigahertz. Leakage from these beams yields radio transients for an observer viewing the source and destination exoplanets in conjunction on the sky.
45
47
224
7,727
Paper here: SETI VIA LEAKAGE FROM LIGHT SAILS IN EXOPLANETARY SYSTEMS iopscience.iop.org/article/1…
4
11
1,190
Professor Avi Loeb retweeted
Very pleased to be a part of this new college offering regarding #UAP. The number of academic institutions doing this is growing by the day, & I will always accept any school which asks me to speak & support our next generation unlocking the new reality that we are not alone.
I welcome Farmingdale State College’s new course examining UAP through science, public safety, national security, and policy. Serious academic courses and scientific research are essential to reducing stigma and advancing rigorous, evidence-based study of UAP. Thank you to @DrKeithLTaylor for his leadership in this effort. farmingdale.edu/arts-science…
17
31
224
9,372
I welcome Farmingdale State College’s new course examining UAP through science, public safety, national security, and policy. Serious academic courses and scientific research are essential to reducing stigma and advancing rigorous, evidence-based study of UAP. Thank you to @DrKeithLTaylor for his leadership in this effort. farmingdale.edu/arts-science…
24
54
295
25,301
After 12 remote meetings, the UAP Science Advisory Council will convene in Washington, D.C., next week for its first in-person meeting with its government partners. Three months ago, I was contacted by representatives from the ODNI, and AARO, in the Pentagon. They asked me to establish and lead a UAP Science Advisory Council to the US government. Some skeptics who claim to be protecting the public discourse from conspiracy theories are repeatedly promoting on social media over the past three months the conspiracy theory that I'm bluffing and the @UAPSAC doesn't exist. Their psychological stubbornness can only be resolved by their therapists. The council members, on the other hand, have important work to do. We will keep our eyes on the orbs, not on social media, as we deliberate in our upcoming meeting in Washington, D.C.
118
126
811
60,002
Scientists deserve access to reportedly retrieved first-hand UAP evidence. It makes little sense to keep analyzing blurry videos with insufficient information if a shortcut to the truth is already at hand. Whistleblowers should therefore receive the legal assurances needed to disclose everything they know about UAP without fear of retaliation. The historic memo issued by Aaron Lucas, Principal Deputy Director of National Intelligence, recently waived non-disclosure agreements and contractual obligations that prevented former and current government employees from sharing UAP information.
80
138
759
34,588