23-F-0010.pdf

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From: 
Avi Loeb <aloeb@cfa.harvard.edu> 
Sent: 
Tuesday, October 4, 2022 1 :32 PM 
To: 
Abraham Loeb 
Subject: 
[URL Verdict: Neutral][Non-DoD Source] "Down To Earth" Limits on Unidentified Aerial 
Phenomena in Ukraine 
Attachments: 
arXiv_U.pdf 
Follow Up Flag: 
Follow up 
Flag Status: 
Completed 
All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the 
authenticity ofall links contained within the message prior to copying and pasting the address to a Web 
browser. 
The original scientific paper on which this es…

"Down To Earth" Lilllits on Unidentified 
Aerial Phenolllena in Ukraine 
□ 
I □ 
I 
An image of"pha11tom'' objects above Ukraine (C,·edit: Zhilyaev, Petukhov & Reshetnyk 2022) 
Over the past two weeks I was bombarded by a dozen requests to read a new report < Caution­
http: / /me.dm/r-qfQa1Kr PLO?source=email-adboe108a94b-1664904268122­
newsletter .subscribeToProfile-------------------------5 27 4e172_ 8ddo_45f2_ a3 72_ ooehd103e94-------­
c9de49 b8ef2 b > by astronomers on Unidentified Aerial Phenomena (UAP) in Ukraine. My response 
to all of these messages was the same: "I am not sure what t…

They were characterized by a size of3-12 meters and speeds up to 15 kilometers per second at a 
distance ofup to 10-12 kilometers. Ifreal, such objects exceed the capabilities ofhuman-made 
aircrafts or rockets. I quickly realized that the distance of these dark objects must have been 
incorrectly overestimated by an order of magnitude, or else their bow shock in the Earth's atmosphere 
would have generated a bright fireball with an easily detectable optical luminosity. 
The interest in UAP stems from their potential non-human origin. Extraterrestrial equipment could 
arrive in two forms: spac…

through direct imaging. Once an Earth-like planet is targeted, an interstellar device can plunge into its 
atmosphere. In principle, a multitude oftiny devices can be released from a mothership that passes 
near Earth. 
At a final speed of30 kilometers per second, a probe would cross twice the distance ofthe Sun from 
the Milky-Way center within a time ofhalf a billion years. The fraction ofall Sun-like stars that host 
Earth-like planets intheir habitable zone is in the range 3- 100%. This implies that self-replicating 
probes could reach ten billion habitable planets around Sun-like stars in…

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ABOUT THE AUTHOR 
□ 
Avi Loeb is the head ofthe Galileo Project, founding director ofHarvard University's-Black Hole 
Initiative, director ofthe Institute for Theory and Computation at the Harvard-Smithsonian Center 
for Astrophysics, and the former chair ofthe astronomy department at Harvard University (2011­
2020). He chairs the advisory board for the Breakthrough Starshot project, and is a former member of 
the President's Council ofAdvisors on Science and Technology and a former chair ofthe Board on 
Physics and Astronomy ofthe National Academies. He is the bestselling auth…

From: 
Avi Loeb <aloeb@cfa.harvard.edu> 
Sent: 
Monday, October 3, 2022 10:18 AM 
To: 
Kirkpatrick, Sean M HQE OSD OUSD INTEL & SEC (USA) 
Subject: 
[URL Verdict: Neutral]Re: [Non-DoD Source] SALT New York IAvi Loeb: Are We Alone 
in the Universe? The Galileo Project 
All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the 
authenticity ofall links contained within the message prior to copying and pasting the address to a Web 
browser. 
Yes, Sean. I look forward to seeing you at 4PM today. 
Here are some new essays from the last week: 
…

ornmg, 
Still good for 4 this afternoon? 
Best, 
Sean 
a e: 
e nes ay, eptem er 
at : 
To: "Avi Loeb" <aloeb@cfa.harvard.edu < Caution-mailto:aloeb@cfa.harvard.edu > > 
Subject: RE: [Non-DoD Source] SALT New York I Avi Loeb: Are We Alone in the Universe? 
The Galileo Project 
Thanks A vi. Looking forward to seeing you next week. 
From: A vi Loeb <aloeb@cfa.harvard.edu < Caution-mailto:aloeb@cfa.harvard.edu > > 
Sent: Wednesday, September 28, 2022 8:06 AM 
To: Abraham Loeb <aloeb@cfa.harvard.edu < Caution-mailto:aloeb@cfa.harvard.edu > > 
Subject: [Non-DoD Source] SALT New York I Avi Loeb: Are …

From: 
Kirkpatrick, Sean M HQE OSD OUSD INTEL & SEC (USA) 
Sent: 
Monday, October 3, 2022 9:43 AM 
To: 
Avi Loeb 
Subject: 
Re: [Non-DoD Source] SALT New York IAvi Loeb: Are We Alone in the Universe? The 
Galileo Project 
Morning, 
Still good for 4 this afternoon? 
Best, 
Sean 
D OUSD INTEL & SEC (USA)" 
a e: 
e nes ay, ep em er 
at 9:06:00 AM 
To: "Avi Loeb" <aloeb@cfa.harvard.edu> 
Subject: RE: [Non-DoD Source] SALT New York IAvi Loeb: Are We Alone in the Universe? 
The Galileo Project 
Thanks A vi. Looking forward to seeing you next week. 
From: A vi Loeb <aloeb@cfa.harvard.edu> 
Sent: Wedn…