SLOP3255 · Week 01 · Listening claim 001
Can space be heard?#
Before we make the universe audible, we have to say what kind of “hearing” we mean.
One question, three claims#
Physical sound
Pressure waves moving through matter. A medium is required.
Measured signal
Voltage, photon count, strain or intensity recorded by an instrument.
Sonification
A designed mapping that turns values or events into audible parameters.
Which claim is being made when a headline says “NASA recorded the sound of space”?
Vacuum is not silence#
Space is not empty of information. It is usually empty of the medium our ears expect.
What does a telescope actually return?#
| Instrument | Recorded object | Possible audible dimension |
|---|---|---|
| Optical camera | pixel intensity | pitch or loudness |
| Radio dish | power by frequency and time | timbre + playback time |
| Pulsar backend | pulse arrival times | rhythm |
| Interferometer | strain over time | audification or pitch shift |
The detector supplies values. The designer supplies the listening rule.
Two legitimate routes to a speaker#
Audification
Replay an existing time series as audio, usually with a new speed or frequency range.
Preserves: temporal shape.
Parameter mapping
Assign data dimensions to pitch, duration, level, timbre or stereo position.
Reveals: selected relationships.
Neither route is neutral. Each supports a different scientific question.
A synthetic transit-shaped dip#
The values are invented. The shape is useful because we can hear the same source through competing mappings.
Same values, different arguments#
| Rule | What changes | What becomes easy | Risk |
|---|---|---|---|
| Pitch | 220–660 Hz | ordered height | pitch feels more precise than the samples |
| Rhythm | 180–520 ms gap | event timing | source was evenly sampled |
| Level | −24 to −9 dB | large contrast | hearing safety and device variation |
If the interpretation changes, where is the meaning: in the data, or in the mapping?
The accountable signal chain#
This four-part chain becomes the method for the entire semester.
Rewrite the claim#
Too strong
“This is the sound of an exoplanet.”
It hides source, processing and authorship.Checkable
“Relative brightness samples were mapped linearly to pitch and played 320 ms apart.”
A listener can reconstruct what happened.Good disclosure does not make the experience less wondrous. It locates the wonder honestly.
Listening Lab 01 · Output: claim card
Hear first. Inspect second.#
Task
Compare pitch and rhythm mappings of one ten-sample curve. Write what you think changed before seeing the legend.
Deliver
- one evidence claim
- one mapping rule
- one limitation
Reference: NASA Exoplanet Watch · science.nasa.gov/citizen-science/exoplanet-watch/