interstellar medium
Let an agent describe the interstellar medium by phase, composition and role in star formation, with sourced observations.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent describe the interstellar medium by phase, composition and role in star formation, with sourced observations.
The matter and radiation in the space between star systems in a galaxy, including gas, dust, cosmic rays and magnetic fields, from cold molecular clouds to hot ionised regions.
What it is for: The raw material of stars and the recycling medium of galaxies.
It can be observe it across the spectrum; measure density and temperature; map it; study star formation.
Distinguishing features
Matter between stars
Multiple phases
Mostly hydrogen and helium with dust
Site of star formation
What it looks like
Mostly invisible; seen as nebulae, dark clouds and in radio and infrared maps.
Physical character
average density: about 1 atom per cm3 - varies hugely by phase
temperature: 10 K to millions of K kelvin - phases
How it is recognised
Dark dust lanes
Emission and reflection nebulae
Radio maps of hydrogen
Related models
contains - structures
is part of - component
forms - star formation
is studied by - field
In practice
Families and kinds
molecular clouds
cold and warm neutral medium
warm and hot ionised medium
photodissociation regions
dust
Failure modes and hazards
Confusing phases
Overstating certainty of models
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.interstellar-medium
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Phases Components.
Phases differ greatly.
Phase
Molecular to hot.
Phase
Phase.
- Which phase of the medium is meant? definition
- What are its density and temperature? measurement
Composition
Gas and dust.
Composition
Composition.
- What is its composition? measurement
- How was it measured? provenance
Observation How seen.
Multiwavelength observation.
Methods
Radio, infrared.
Methods
Observation methods.
- Which wavelengths reveal it? definition
- Which surveys map it? provenance
Dust
Extinction.
Dust
Dust effects.
- How does dust affect observations? definition
- How is it corrected? action
Role Star formation.
The medium feeds stars.
Star formation
Collapse.
Formation
Star formation.
- Where is star formation happening in it? provenance
- At what rate? measurement
Recycling
Feedback.
Recycling
Recycling.
- How do stars return material to it? definition
- What is the evidence? provenance
Science Models.
Models are uncertain.
Models
Theory.
Models
Models.
- Which models describe it? provenance
- Where do they disagree? boundary
Communication
Accuracy.
Communication
Clear explanation.
- How can it be explained simply? action
- Which images are false colour? boundary
What the second pass must settle
- Should phases be separate entries?
- How should survey maps be linked?
- How should models be marked?