Caleb Scharf
@calebscharf.bsky.social
Thinker, writer, sometimes both at the same time. Senior Scientist for Astrobiology at NASA Ames. Personal account, anything expressed here is my fault alone.
Pinned
Caleb Scharf
@calebscharf.bsky.social
· Oct 22
Is Colonizing Space the Next Stage of Human Evolution?
Life expanded from tidal pools to forests to great cities. The next step is space.
time.com
Fun little conversation with Jeffrey Kluger at TIME about The Giant Leap and the future of space exploration is now available. (spoiler: space is undoubtedly part of our future, but it could be a slow and tricky story): time.com/7326642/colo...
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...
Caleb Scharf: Searching for Life in Space and the Shadow Biosphere
YouTube video by Brad Carr
www.youtube.com
November 29, 2025 at 2:40 PM
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...
Reposted by Caleb Scharf
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: https://scim.ag/4rqTOCj
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: https://scim.ag/4rqTOCj
November 20, 2025 at 7:05 PM
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: https://scim.ag/4rqTOCj
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: https://scim.ag/4rqTOCj
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...
November 19, 2025 at 4:54 PM
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...
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.
November 19, 2025 at 2:25 PM
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.
A must listen…!
New podcast episode! 🪨🧪🤖🎙🖖
Dr. @anirudhprabhu.bsky.social joins me to discuss how we use machine learning trained on organic chemical data to detect the "whispers" of life—specifically photosynthetic life—in ancient rocks.
Dr. @anirudhprabhu.bsky.social joins me to discuss how we use machine learning trained on organic chemical data to detect the "whispers" of life—specifically photosynthetic life—in ancient rocks.
Episode 192: Whispers of Life in Ancient Rocks
Guest: Dr. Anirudh Prabhu
Mike brings aboard Dr. Anirudh Prabhu to discuss an exciting new study of theirs that uses machine learning trained on organic chemical data to detect the
soundcloud.com
November 18, 2025 at 3:23 PM
A must listen…!
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...
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.
bigthink.com
November 17, 2025 at 2:50 PM
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...
Reposted by Caleb Scharf
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...
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...
November 16, 2025 at 9:20 PM
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...
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...
Great news!
🛰️🛰️ The twins are talking!
We have successfully established contact with both ESCAPADE spacecraft, 💙 Blue and 💛 Gold, following launch on Blue Origin's New Glenn rocket today.
We're on our way to Mars to enable NASA and UC Berkeley Space Sciences Lab to study the Martian magnetosphere!
We have successfully established contact with both ESCAPADE spacecraft, 💙 Blue and 💛 Gold, following launch on Blue Origin's New Glenn rocket today.
We're on our way to Mars to enable NASA and UC Berkeley Space Sciences Lab to study the Martian magnetosphere!
November 14, 2025 at 7:39 PM
Great news!
Reposted by Caleb Scharf
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...
We pulled out 5 of the most mind-blowing ideas and posted the full recording here.👇🤯
carnegiescience.edu/five-ways-ca...
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...
carnegiescience.edu
November 13, 2025 at 4:58 PM
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...
We pulled out 5 of the most mind-blowing ideas and posted the full recording here.👇🤯
carnegiescience.edu/five-ways-ca...
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...
The Giant Leap
YouTube video by Carnegie Science
www.youtube.com
November 12, 2025 at 3:43 PM
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...
Reposted by Caleb Scharf
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...
www.scientificamerican.com/article/is-s...
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
www.scientificamerican.com
November 10, 2025 at 3:24 PM
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...
www.scientificamerican.com/article/is-s...
Simultaneously beautiful and the stuff of small human nightmares...
A pitch-black cave in the Balkans is home to what appears to be the world’s largest spider web, which researchers say is a singular work of cooperation by two usually-hostile species of spider. www.nytimes.com/2025/11/08/s...
November 9, 2025 at 9:34 PM
Simultaneously beautiful and the stuff of small human nightmares...
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]
November 9, 2025 at 9:22 PM
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]
Indeed…definitely the B Ark
Speaking as a spacecraft engineer, the thing that gets me about Loeb's interpretations is that his alien engineers are insultingly incompetent.
RCS thruster plumes visible from the other side of the solar system, making no difference in the trajectory?!
And 'Oumuamua was a *terrible* solar sail.
RCS thruster plumes visible from the other side of the solar system, making no difference in the trajectory?!
And 'Oumuamua was a *terrible* solar sail.
November 8, 2025 at 8:22 PM
Indeed…definitely the B Ark
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...
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...
www.kpcw.org
November 8, 2025 at 7:38 PM
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...
Ah yes, back to the horrors of NYC 🤣
November 8, 2025 at 5:12 PM
Ah yes, back to the horrors of NYC 🤣
Congratulations Jason! Amazing!
November 4, 2025 at 4:04 PM
Congratulations Jason! Amazing!
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
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 ...
carnegiescience.edu
November 4, 2025 at 3:08 PM
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
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.
November 4, 2025 at 3:06 PM
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.
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.
November 4, 2025 at 3:03 PM
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.
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
November 1, 2025 at 9:24 PM
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
Reposted by Caleb Scharf
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...
www.hive.co.uk/Product/Marc...
November 1, 2025 at 3:45 PM
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...
www.hive.co.uk/Product/Marc...
Reposted by Caleb Scharf
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...
“I have done a terrible thing, I have postulated a particle that cannot be detected”
- Wolfgang Pauli
www.hive.co.uk/Product/Marc...
November 1, 2025 at 3:40 PM
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...
“I have done a terrible thing, I have postulated a particle that cannot be detected”
- Wolfgang Pauli
www.hive.co.uk/Product/Marc...
Reposted by Caleb Scharf
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
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
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 ...
bit.ly
October 31, 2025 at 2:52 PM
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
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
Reposted by Caleb Scharf
Teaching chatbots to say “I don’t know” could curb hallucinations.
It could also break #AI’s business model. https://scim.ag/49cPY9d
It could also break #AI’s business model. https://scim.ag/49cPY9d
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
scim.ag
October 30, 2025 at 4:53 PM
Teaching chatbots to say “I don’t know” could curb hallucinations.
It could also break #AI’s business model. https://scim.ag/49cPY9d
It could also break #AI’s business model. https://scim.ag/49cPY9d