New 3D maps show the Milky Way's 'empty' space is turbulent, not stable
Fresh interstellar-medium mapping contradicts the 1969 and 1977 textbook models that treated galactic gas as quietly settling into fixed temperature states.
What to know
- New 3D maps of the interstellar medium across thousands of light-years show much of the gas is unstable rather than settling into the stable cold/warm states predicted by the 1969 Field-Goldsmith-Habing model.
- The finding contradicts textbook theory, including the 1977 McKee-Ostriker extension that added a hot supernova-driven phase but still assumed calm equilibrium elsewhere.
- The instability could help explain a long-standing open question in astrophysics: how quickly stars actually form.
George Field AstrophysicistDonald Goldsmith AstrophysicistHarm Habing AstrophysicistChris McKee AstrophysicistJeremiah Ostriker Astrophysicist
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New galaxy-spanning maps reveal the ISM is largely unstable
Using newly developed maps stretching thousands of light-years across the galaxy, astrophysicists found that much of the interstellar medium does not sit in the stable cold or warm states predicted since 1969, directly contradicting textbook models and offering a possible clue to how quickly stars form.
“I thought I was wrong. How do you go to your science adviser and tell him that you get so much unstable media?”
— unnamed researcher quoted in Quanta Magazine -
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Over the past few years, astrophysicists have transformed our understanding of the interstellar medium. Using newly developed maps stretching thousands of light-years across our galaxy, they’ve discovered that it’s not the quiet, steady backdrop that researchers thought. Instead, much of the ISM appears to be unstable — a finding that directly…
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After the Big Bang, our galaxy was left with a thin fog of molecules, known as the interstellar medium. New maps reveal that it’s got a lot more going on than we thought. https://www. quantamagazine.org/a-new-map-o f-empty-space-challenges-a-tranquil-picture-of-the-galaxy-20261030/
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background
New Horizons measures interstellar hydrogen density beyond Pluto — NASA's New Horizons spacecraft, past Pluto's orbit, measured a proxy showing roughly 130 hydrogen atoms per liter in the surrounding interstellar medium.
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background
McKee and Ostriker add a hot supernova-driven third phase — Chris McKee and Jeremiah Ostriker extended the model to include a scorching half-million-kelvin plasma phase at supernova shock fronts, while still assuming atomic gas outside blast zones reached calm, pressure-balanced equilibrium.
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background
Field, Goldsmith and Habing propose a two-phase ISM model — The researchers predicted the interstellar medium exists stably in either a cold (~100 K) or warm (~8,000 K) state, with atoms transitioning between them almost instantly and leaving little unstable gas behind.
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first by Quanta Magazine, 9d ago · also Quanta