The universe,
on the record.
Beautiful questions deserve better than easy answers. Follow the evidence behind the phenomena, from fleeting particles to the shape of spacetime.
An independent science-communication project by Caleb Aiken.
CURVATURE / LIGHT
NOT TO SCALE
Not a collection of conclusions. A collection of ways to know.
ARCHIVE 001 · RELATIVITY / PARTICLE PHYSICS
A particle's life.
An Einstein-sized mystery.
Cosmic-ray muons are born high in the atmosphere and live for just 2.197 microseconds on average. Why do we detect them at ground level? Discover the physics through a live simulator, two reference frames, the full derivation, and a five-question quiz.
Open Archive 001 ↗ Browse the lessons ↗THE RESEARCH LIBRARY
Follow a thread.
Each field note starts with a question and points toward the underlying evidence. Our first complete interactive lesson is now in The Physics Archive.
IN THIS PROTOTYPE
No field notes found. Try a different topic or search phrase.
An honest beginning. These six field notes remain a prototype collection. Archive 001 is a full interactive lesson. Video players will appear when the published URLs are confirmed.
001—006TRY THE PHYSICS
A lifetime
stretched by motion.
Muons created in the upper atmosphere can reach detectors on the ground. Explore how their average travel distance changes as their speed approaches the speed of light.
Change the velocity.
Assume constant speed, a mean proper lifetime of 2.197 μs, and no energy loss. These are model averages—not a maximum distance or a simulation of atmospheric transport.
Move the slider to calculate the Lorentz factor, lifetime in the Earth frame, and average distance traveled before decay.
The crucial distinction: individual muon decays are random. Time dilation changes the distribution of survival times, not a fixed expiration clock.
Underlying lifetime measurementBEHIND EVERY EXPLANATION
Show the wonder.
Show the work.
Good science communication doesn't erase uncertainty. It helps you see where a conclusion came from—and where its limits begin.
Ask precisely
Start with a question that can be answered—or clearly marked as unresolved.
Trace the source
Connect explanations to experiments, peer-reviewed papers, and reliable reference data.
Label the model
Make approximations visible. Distinguish a useful toy model from nature in full detail.
Stay correctable
Leave room for new evidence, improved explanations, and openly recorded corrections.
THE ARCHIVE IS ALWAYS OPENTO BETTER QUESTIONS.
Hello, I'm Caleb.
I'm Caleb Aiken, a physics graduate of the University of Massachusetts Amherst. My work and interests run from particle detection and experimental electronics to quantum theory, gravity, and the mysteries that connect them.
Crimson Archive is where I turn that curiosity into animated, research-grounded explanations. This companion site is the place for the references, assumptions, and extra questions that won't fit into a Short.
Some videos may use an AI recreation of my own voice. Scientific responsibility and final editorial review remain mine.