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\title{Science AMA Series: I'm Christophe Galfard, a theoretical physicist and
author of The Universe In Your Hand. I write and speak about the science
of the universe, from black holes to our cosmic origins and nearly
everything in between. AMA!}



\author[1]{Christophe_Galfard }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


\vspace{-1em}



  
  \date{April 24, 2026}


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\begin{abstract}
Hello Reddit! My name is Dr. Christophe Galfard and I'm a theoretical
physicist and author of The Universe In Your Hand. I hold a Ph.D. in
Theoretical Physics from Cambridge University where my supervisor was
the world-renowned Professor Stephen Hawking. I worked with him on black
holes and the origin(s) of our universe for many years. While I'm no
longer at Cambridge, I now spend pretty much all my time spreading
scientific knowledge to the general public in {[}hopefully{]}
entertaining ways. From the tiniest particles to the edge of our known
universe as well as theoretical scientific attempts to unify all known
forces in a Theory of Everything, I seek to help everyone understand the
science of our world - as it is seen by today's scientists. How was our
universe formed? Why do stars die and why do some of them become black
holes? Our world is filled with mystery, excitement, and questions whose
answers still escape the brightest minds to walk on Earth. My goal is to
help everyone who wants to learn more about our universe and how it
works in a way that anyone is able to understand and grasp. If you've
ever had a question about the solar system, the Big Bang, dark matter,
parallel universes, quarks, or anything else (science related!), now's
the time. I will be back to answer your questions at 3 pm EDT, Ask me
anything! Well, there are so many brilliant questions that I've left
unanswered that I feel a bit bad about it, but it is time for me to wrap
this up\ldots{} I'll try to come back to answer some of these in the
days to come. In the mean time, thank you so much for your questions,
I've had a great time answering as many as I could! And don't ever
forget to keep asking questions about our beautiful world! Christophe%
\end{abstract}%



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