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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The universe is still making stars, but galaxies as a population are forming them much less rapidly than they did near the height of cosmic star formation. A peer-reviewed 2014 synthesis places that global peak about 3.5 billion years after the Big Bang; the subsequent decline is a drop in the rate of new star formation, not the disappearance of stars already shining.
What does it mean for the rate of starbirth to fall?
Astronomers describe the history of star formation using the cosmic star-formation-rate density: the average rate at which galaxies turn gas into stars per unit of comoving volume. It measures how quickly new stars are being made across a representative volume of the universe. It is not a count of all stars that exist.
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That distinction matters. The rate can fall even while the total population of stars continues to grow, because stars formed earlier remain part of the accumulated stellar population. “Crashing” is vivid headline language; the evidence describes a decline from a past peak, not an abrupt end to star formation.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhen did the universe stop making stars so quickly?
It did not stop. In their 2014 review of cosmic star-formation history, Piero Madau and Mark Dickinson place the population-wide maximum about 3.5 billion years after the Big Bang, at a redshift of approximately 1.9. Their fitted post-peak decline has an e-folding timescale of 3.9 billion years (Madau and Dickinson, “Cosmic Star-Formation History”).
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An e-folding timescale describes the characteristic pace of an exponential decline: after one such timescale, the fitted quantity would be about 1/e of its starting value if that exponential model held. It is not a claim that the rate drops by a fixed percentage every year, nor does it mean every galaxy followed the same curve.
Most of today’s stellar mass formed over a long interval
The same 2014 synthesis estimates that half of the stellar mass observed today had formed before redshift 1.3. About 25% formed before the cosmic star-formation peak, and another 25% formed after redshift 0.7. These are statements about when stellar mass accumulated, not evidence that star formation switched off at a particular moment.
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Why are fewer stars forming now?
The global rate summarizes many galaxies with different histories; it should not be read as a single galaxy steadily dimming. The overall decline means that, across the population, the average pace of turning gas into new stars has decreased since its maximum. The cited sources establish that trend, but do not justify reducing it to one cause or claiming every galaxy changed in the same way.
How do astronomers know how many stars formed billions of years ago?
There is no direct time-lapse recording of the universe’s galaxies. Instead, astronomers observe galaxies at different distances and wavelengths. Because light takes time to travel, distant galaxies are seen as they were at earlier cosmic epochs. Researchers combine these observations and complementary techniques to reconstruct the population’s history of star formation and stellar-mass growth.
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This is a reconstruction from galaxy samples, not a direct record of one galaxy’s complete life. A NASA graph first released in 1996 and updated in 2025 is useful for seeing how the history was presented in the earlier observational picture, but NASA noted that the original measurements left a gap around the peak. Its graphic should not be treated as a current precision measurement (NASA Science, “Second Graph Tracing the History of the Rate of Star Formation”).
What the 2025 Euclid–Herschel result adds
A University of British Columbia release dated November 5, 2025, describes an analysis of 2.6 million galaxies using Euclid and Herschel observations. It reports that average galactic dust temperatures were about 10 kelvins warmer ten billion years ago, and that galaxies with higher star-formation rates tend to have hotter dust. The release describes the associated paper as a preprint, so this is a recent preliminary result rather than a replacement for the established peer-reviewed synthesis.
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Dust temperature is related to star formation, but it is not a direct count of newborn stars. UBC cosmologist and preprint author Douglas Scott said, “The amount of dust in galaxies and their dust temperatures have been decreasing for billions of years, which means we’re past the epoch of maximum star formation.” The statement is attributed to the preprint’s author and reflects the release’s interpretation of that evidence (University of British Columbia Faculty of Science, November 5, 2025).
Did the Milky Way’s star formation peak before the Sun formed?
NASA’s 2015 account says the Milky Way’s star-birthing activity peaked about 10 billion years ago. It reports that Milky Way-like galaxies formed stars at roughly 30 times today’s rate during their peak era. That comparison concerns galaxies similar in mass to the Milky Way; it is not the rate for the universe as a whole.
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Researchers inferred the Milky Way’s earlier activity by examining deep-survey samples of galaxies with similar masses, rather than observing direct “baby pictures” of our own galaxy. This makes the comparison a useful illustration of galactic history, not a separate measurement of the global cosmic rate (NASA Goddard Space Flight Center, “Our Sun Came Late to the Milky Way’s Star-Birth Party,” April 9, 2015).
Is the universe running out of stars?
No. The claim is that the universe is forming new stars more slowly than it did at its peak. Existing stars do not disappear simply because the rate of new star formation has declined. The cosmic rate is a population average, and individual galaxies need not match that average or share one identical history.
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