Sign in

Caleb Scharf

@calebscharf.bsky.social
256 followers 44 following 146 posts

Thinker, writer, sometimes both at the same time. Senior Scientist for Astrobiology at NASA Ames. Personal account, anything expressed here is my fault alone.

PostsRepliesMedia
Caleb Scharf @calebscharf.bsky.social · 18/09/2026
Our latest seminar video on scientific AI/ML is out! An amazing talk by Dr Eric Wolf on his adoption of agentic workflows for exoplanetary climate modeling research. Parts technical, parts philosophical, and parts personal. An essential resource... www.youtube.com/watch?v=YRYt...
youtube.com
AI/ML Seminar Series - Agentic AI Workflows - 9/17/26
YouTube video by AI-ML Astrobiology
100
Caleb Scharf @calebscharf.bsky.social · 11/09/2026
I’m very excited to share that I’ll be serving as Project Scientist for NASA’s First Look Science Team working with the remarkable Impact AI team at Marshall Space Flight Center in Huntsville and at IBM to build a Mars Atmosphere AI Foundation Model (MAFM).
101
Reposted by Caleb Scharf
Michael Wong @miquai.bsky.social · 19/08/2026
Tomorrow at the @exploratorium.bsky.social! I’m so excited to be a part of this event at my childhood science museum!
051
Caleb Scharf @calebscharf.bsky.social · 24/06/2026
New paper: Astrobiology in the Time of Artificial Intelligence - a look at the history and future of machine learning and computing for space exploration and life detection in the context of the Viking missions 50th anniversary arxiv.org/abs/2606.23854 (Astrobiology Journal)
arxiv.org
Astrobiology in the Time of Artificial Intelligence
The Viking missions showcased multiple spaceflight technologies representing state-of-the-art capabilities: from digital line-scan imaging to the operation of complex onboard laboratories and software...
010
Caleb Scharf @calebscharf.bsky.social · 12/06/2026
If you want to be better informed about the history and possible future of space exploration I wrote the book for you: www.hachettebookgroup.com/titles/caleb...
hachettebookgroup.com
The Giant Leap
A leading astrobiologist argues that space travel is an evolutionary event at least as important as life’s first journey from sea to land"The Giant Leap is...
020
Caleb Scharf @calebscharf.bsky.social · 24/03/2026
My interview on Planetary Radio about The Giant Leap and the past, present, and future of space exploration is now available! www.planetary.org/planetary-ra...
planetary.org
Book Club Edition: The Giant Leap: Why Space is the Next Frontier in…
Astrobiologist Caleb Scharf eloquently explores the future of humanity and what we will become when we live beyond Earth.
000
Caleb Scharf @calebscharf.bsky.social · 21/03/2026
New podcast about The Giant Leap just dropped : www.planetary.org/planetary-ra...
planetary.org
Book Club Edition: The Giant Leap: Why Space is the Next Frontier in…
Astrobiologist Caleb Scharf eloquently explores the future of humanity and what we will become when we live beyond Earth.
000
Reposted by Caleb Scharf
Astrobiology @astrobiology.bsky.social · 17/02/2026
If Alien Signals Reached Earth, Why Haven't We Seen Them? astrobiology.com/2026/02/if-a... #astrobiology #SETI #technosignature
astrobiology.com
If Alien Signals Reached Earth, Why Haven't We Seen Them? - Astrobiology
astronomers have scanned the Milky Way for signs of advanced extraterrestrial civilizations
092
Caleb Scharf @calebscharf.bsky.social · 17/02/2026
Excited to share preprint of my new research: The Interplanetary Habitable Zone - habitability for space-faring species. A maths framework & agent-based simulation approach: arxiv.org/abs/2602.13404
020
Caleb Scharf @calebscharf.bsky.social · 03/02/2026
You know it's a good science day when you get to write "boundedly rational utility maximizers" in an astrobiology research paper
000
Reposted by Caleb Scharf
Michael Wong @miquai.bsky.social · 27/01/2026
Why might our future in space look more like living on Deep Space Nine than colonizing other planets? Dr. @calebscharf.bsky.social explains on this recent episode of Strange New Worlds: A Science & Star Trek Podcast! soundcloud.com/strange-new-...
media.tenor.com
a space ship with the letter b on the front
ALT: a space ship with the letter b on the front
77111
Reposted by Caleb Scharf
Elise Cutts @elisecutts.bsky.social · 28/01/2026
New planet just dropped and it 1) is almost exactly Earth-sized 2) has a year that's almost exactly 1 Earth year. 3) orbits a star that is not a 💢temperamental little shit M-dwarf 💢but is instead a 🧡 good orange boi 🧡 Me for @science.org based on results presented at #RockyWorlds4: 🔭🧪
science.org
Earth-size planet spotted with yearlong orbit
Long-overlooked Kepler signal discovered by citizen scientists reveals promising world worth a closer look
491513427
Caleb Scharf @calebscharf.bsky.social · 25/01/2026
Yup
011
Caleb Scharf @calebscharf.bsky.social · 23/01/2026
If you want to know what it's like when two scientists who really enjoy each other's company sit down for a conversation about science, space, and life in the universe, well here's the answer:
193
Caleb Scharf @calebscharf.bsky.social · 15/01/2026
I can attest that this is a terrific book!
031
Caleb Scharf @calebscharf.bsky.social · 14/01/2026
@nautil.us has this excellent series of "greatest revelations" from authors and others. I got to have my turn in talking about The Giant Leap and the things it revealed to me along the way... nautil.us/space-explor...
nautil.us
Space Exploration Speaks to the Core of Who We Are
Space Exploration Speaks to the Core of Who We Are: Astrobiologist Caleb Scharf’s 3 greatest revelations while The Giant Leap.
000
Caleb Scharf @calebscharf.bsky.social · 10/01/2026
Thrilled to see a great review of The Giant Leap over at the @wsj.com ! “A scintillating tour of mankind’s explorations in space so far.” 😀 www.wsj.com/arts-culture...
wsj.com
‘The Giant Leap’ and ‘The Pale Blue Data Point’: Adventure Is Out There
Plus Jon Willis’s “The Pale Blue Data Point.”
042
Caleb Scharf @calebscharf.bsky.social · 07/01/2026
For a moment this phrasing gave me a nice vision of pigs sitting around discussing ancestry…
000
Caleb Scharf @calebscharf.bsky.social · 06/01/2026
New interview about The Giant Leap is now available - many thanks to Smithsonian Associates and Paul Vogelzang for a terrific conversation! podcasts.apple.com/us/podcast/t...
podcasts.apple.com
🎙️The Giant Leap: Is Space the Future of Life on Earth?
Podcast Episode · The Not Old - Better Show · 12/30/2025 · 39m
000
Caleb Scharf @calebscharf.bsky.social · 05/01/2026
This is just incredible and lovely! Life in the abyss.
000
Reposted by Caleb Scharf
Dr. Wildlife @drwildlife.bsky.social · 23/12/2025
I haven’t stopped thinking about this frog since learning about it a few days ago, so now this knowledge is your problem too. Meet the turtle frog (Myobatrachus gouldii) – a round burrow gremlin from Australia. It gets its name from looking like a turtle that lost its shell. 📸 Stephen Zozaya
Photo of a turtle frog. Attribution: By Stephen Zozaya - Vertucci S, Pepper M, Edwards DL, Roberts JD, Mitchell N, Keogh JS (2017) Evolutionary and natural history of the turtle frog, Myobatrachus gouldii, a bizarre myobatrachid frog in the southwestern Australian biodiversity hotspot. PLoS ONE 12(3): e0173348.doi:10.1371/journal.pone.0173348.g001., CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=58023200
1262378341
Caleb Scharf @calebscharf.bsky.social · 23/12/2025
Thanks @brianclegg.bsky.social for such a thoughtful review! Delighted that the book was of interest!
031
Caleb Scharf @calebscharf.bsky.social · 19/12/2025
It's Friday, the holidays are upon us, what better time to read a book about the amazing enterprise of space exploration, and what it means for life on Earth!
120
Caleb Scharf @calebscharf.bsky.social · 11/12/2025
Another conversation about my new book The Giant Leap (@BasicBooks) is now live! Space exploration is such a rich topic and it stirs so many viewpoints, it's very fascinating. convergingdialogues.substack.com/p/456-the-fu...
010
Caleb Scharf @calebscharf.bsky.social · 29/11/2025
New conversation about my book The Giant Leap and quite a lot more - life in the universe, data, and the future of space w. Brad Carr: www.youtube.com/watch?v=g5Kd...
youtube.com
Caleb Scharf: Searching for Life in Space and the Shadow Biosphere
YouTube video by Brad Carr
020
Reposted by Caleb Scharf
Science Magazine @science.org · 20/11/2025
This image shows 3D, millimeter-thick, and cell-embeddable semiconducting hydrogel fibers. These fibers can be used to construct interwoven living transistors that mimic real neuronal connections in the brain, redefining the boundary between technology and life. Learn more: scim.ag/4rqTOCj
This image shows three-dimensional, millimeter-thick, and cell-embeddable semiconducting hydrogel fibers.
14410
Caleb Scharf @calebscharf.bsky.social · 19/11/2025
I am puzzled by Bluesky: posts here seem to have a really hard time being seen by...well, anyone. Maybe I'm just losing my touch...
110
Caleb Scharf @calebscharf.bsky.social · 19/11/2025
In my new book I explore the complex history of space exploration and its staggering impacts on human life and all life on Earth - for better or worse. To see what the future might bring we have to place space into context, as fundamental change to evolutionary possibilities.
021
Caleb Scharf @calebscharf.bsky.social · 18/11/2025
A must listen…!
031
Caleb Scharf @calebscharf.bsky.social · 17/11/2025
ICYMI had a terrific time talking with @adamfrank4.bsky.social for this @bigthink.com interview about The Giant Leap (Basic Books) and the implications of space exploration for the near and far future of life on Earth. bigthink.com/13-8/the-nex...
bigthink.com
The next great leap in evolution may lie beyond Earth
NASA’s Caleb Scharf talks with Big Think about how life’s story may be entering a new chapter — one that unfolds beyond Earth.
000
Reposted by Caleb Scharf
Corey S. Powell @coreyspowell.bsky.social · 16/11/2025
Marvelous new image of interstellar Comet 3I/ATLAS, taken by photographer Satoru Murata before dawn this morning. On the right you can also see galaxy NGC 4691. There should be a lot more pictures coming in soon. 🧪🔭 www.facebook.com/groups/22700...
Interstellar comet ATLAS seen early this morning as a thin crescent moon passed immediately next to it. Still was able to capture three separate jets of ionic tail, and an anti tail? Or the dust tail? The comet was also passing by the galaxy NGC4691, which really gave the impression of the object being from another world.
313234
Caleb Scharf @calebscharf.bsky.social · 14/11/2025
Great news!
010
Reposted by Caleb Scharf
Carnegie Science @carnegiescience.bsky.social · 13/11/2025
ICYMI: Last week, @calebscharf.bsky.social asked us to imagine space exploration as life’s next "Giant Leap" during our most recent #NeighborhoodLecture. We pulled out 5 of the most mind-blowing ideas and posted the full recording here.👇🤯 carnegiescience.edu/five-ways-ca...
carnegiescience.edu
Five ways Caleb Scharf’s "The Giant Leap" might rewire how you think about life
At a recent Neighborhood Lecture, NASA astrobiologist Caleb Scharf invited audiences to see space exploration not as a race to new worlds, but as biology in motion—life extending its reach beyond Eart...
022
Caleb Scharf @calebscharf.bsky.social · 12/11/2025
New video! My full presentation about The Giant Leap to a live audience at @carnegiescience.bsky.social is now online! We grappled with science, philosophy, and the meaning of life! www.youtube.com/watch?v=cG1V...
youtube.com
The Giant Leap
YouTube video by Carnegie Science
043
Reposted by Caleb Scharf
Lee Billings @leebillings.bsky.social · 10/11/2025
Now on @sciam.bsky.social: In his new book, The Giant Leap, NASA astrobiologist @calebscharf.bsky.social says the fate of life on Earth may hinge on leaving our planet behind. www.scientificamerican.com/article/is-s...
scientificamerican.com
Is Space the Place for Earth’s Next Evolutionary Leap?
In a new book, NASA astrobiologist Caleb Scharf says the fate of life on Earth may hinge on leaving our planet behind
021
Caleb Scharf @calebscharf.bsky.social · 09/11/2025
Simultaneously beautiful and the stuff of small human nightmares...
110
Caleb Scharf @calebscharf.bsky.social · 09/11/2025
A topic that has come up in interviews and presentations for my new book The Giant Leap is reconceptualizing the notion of habitability for a planetary system (like ours) where life disperses from its point of origin. I use this graphic to help discuss: [1/n]
100
Caleb Scharf @calebscharf.bsky.social · 08/11/2025
Indeed…definitely the B Ark
101
Caleb Scharf @calebscharf.bsky.social · 08/11/2025
A new, fun conversation with Lyn Ware Peek at Cool Science Radio for NPR's KPCW all about space exploration and my new book The Giant Leap: www.kpcw.org/show/cool-sc...
kpcw.org
How life evolves beyond Earth
Astrobiologist Caleb Scharf discusses his new book, "The Giant Leap: Why Space Is the Next Frontier in the Evolution of Life," exploring how humanity’s expansion into space represents a profound new p...
010
Caleb Scharf @calebscharf.bsky.social · 08/11/2025
Ah yes, back to the horrors of NYC 🤣
110
Caleb Scharf @calebscharf.bsky.social · 04/11/2025
Congratulations Jason! Amazing!
000
Caleb Scharf @calebscharf.bsky.social · 04/11/2025
I'm excited to be heading to DC later this week to give a public talk at the amazing @carnegiescience.bsky.social about the ideas in my new book The Giant Leap! carnegiescience.edu/giant-leap-nls
carnegiescience.edu
The Giant Leap
NASA Astrobiologist and author Caleb Scharf explores how humanity’s expanding reach into space marks a pivotal moment in life’s evolution—revealing what it means for a species to step beyond its home ...
010
Caleb Scharf @calebscharf.bsky.social · 04/11/2025
The solar system represents scales of space, causal connection, and resources that life on Earth has not encountered before. What will this do to us and to all life as our efforts to explore and experiment in space expand? This is a major theme of The Giant Leap.
020
Caleb Scharf @calebscharf.bsky.social · 04/11/2025
The solar system represents scales of space, causal connection, and resources that life on Earth has not encountered before. What will this do to us and to all life as our efforts to explore and experiment in space expand? This is a major theme of The Giant Leap.
000
Caleb Scharf @calebscharf.bsky.social · 01/11/2025
Wow, the 10,000 th Starlink satellite was recently launched. The growth of space enterprise is hard to ignore - and is something I discuss in my new book The Giant Leap in the much larger context of the history of life on Earth
000
Reposted by Caleb Scharf
Marcus Chown @marcuschown.bsky.social · 01/11/2025
The two physicists who detected the neutrino in 1956, Frederick Reines and Clyde Cowan, had wanted to put their detector 50 metres from the destination of an atomic bomb! In the end, they settled for a nuclear reactor. www.hive.co.uk/Product/Marc...
2185
Reposted by Caleb Scharf
Marcus Chown @marcuschown.bsky.social · 01/11/2025
The man who predicted the existence of neutrinos, Wolfgang Pauli in 1930, bet a case of champagne that nobody would ever detect them. “I have done a terrible thing, I have postulated a particle that cannot be detected” - Wolfgang Pauli www.hive.co.uk/Product/Marc...
24611
Reposted by Caleb Scharf
Carnegie Science @carnegiescience.bsky.social · 31/10/2025
For the 1st time in 4 billion years, life has escaped its home planet! Join NASA Ames astrobiologist @calebscharf.bsky.social as we venture into the void to see how space exploration is reshaping our next great leap. 🗓️ 11/6 | 6:30 PM EST 📍 Carnegie Science, NW DC & Online 🎟️ RSVP → bit.ly/4qxBBT7
bit.ly
The Giant Leap
NASA Astrobiologist and author Caleb Scharf explores how humanity’s expanding reach into space marks a pivotal moment in life’s evolution—revealing what it means for a species to step beyond its home ...
054
Reposted by Caleb Scharf
Science Magazine @science.org · 30/10/2025
Teaching chatbots to say “I don’t know” could curb hallucinations. It could also break #AI’s business model. scim.ag/49cPY9d
scim.ag
AI hallucinates because it’s trained to fake answers it doesn’t know
Teaching chatbots to say “I don’t know” could curb hallucinations. It could also break AI’s business model
25716
Caleb Scharf @calebscharf.bsky.social · 30/10/2025
Potentially contentious idea: space exploration is less about ignoring Earthly problems and more about giving ourselves a chance to do better...
062