A SCIENCE EXPEDITION / 3 CHAPTERS / 8 STOPS
A Signal Across the Dark
How do we separate a cosmic signal’s journey from the engine that sent it?
Straighten a fictional radio pulse, investigate an observed burst, and compare a separate neutrino case. Follow the difference between detecting a signal, locating a source and explaining its engine.
90–150 minutes, across several visits. No deadline; each chapter is a natural place to pause.
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EXPEDITION COMPLETE
You followed the evidence.
Which measurements locate a source, which depend on a distance model, and what additional evidence would identify the engine rather than only constrain it?
Your completion marks record your journey, not a qualification or a test score. Revisit any stop below, or choose another expedition.
Choose another expedition →Chapter 1 · Turn a sweep into a clue
- 01
Interactive lab
Investigate a synthetic radio record
Ready to exploreAlign the channels and compare the signal cases. Every record and host candidate in this lab is fictional teaching data, so keep the exercise separate from an observed FRB.
- 02
Printable activity
Defend an interpretation of the clues
Ready to exploreUse the worksheet or paper-only clues to compare dispersion, repetition, interference and host association. Explain why sharpening a pulse does not identify its engine.
Chapter 2 · Give a real burst an address
- 03
Investigation
Move from the exercise to a measured event
Ready to exploreFollow the detection, localization and host work for FRB 20240304B. Identify which results are measured and which source explanations remain proposed.
- 04
Evidence File
Check what the host’s redshift establishes
Ready to exploreSeparate a radio position, a host association and a spectral redshift. Why does converting redshift into cosmic time require an additional model?
- 05
Interactive lab
Explore a shift without overreading it
Ready to exploreUse the teaching model to inspect wavelength shifts. Keep the local Doppler illustration distinct from the cosmological interpretation of a distant host’s redshift.
Chapter 3 · Change the messenger
- 06
3D Atlas
Place the measurement in a cosmic model
Ready to exploreExplore the illustrated Local Group and larger-scale structure. Distinguish a model’s distances and arrangement from the measured record of an individual burst.
- 07
3D Atlas
Catch a different cosmic messenger
Ready to exploreFollow how IceCube uses light produced in detector ice to investigate neutrinos. This is a different messenger and detector, not a follow-up observation of FRB 20240304B.
- 08
Evidence File
Compare a separate source claim
Ready to exploreAudit the neutrino evidence associated with NGC 1068. Compare detection, association and interpretation with the FRB case without merging these separate observations.
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