Hibernating bacteria can invade hospitals and survive outer space—but their energy budget reveals a weakness

A spore is a bacterium's survival capsule: dried almost solid and wrapped in protein armor, with its chemical processes shut down. Bacteria enter this state of hibernation when environmental conditions are unfavorable. The science-journalism coverage adds useful context, while the strongest evidential footing still comes from the underlying data, papers or institutional documentation.

It matters because cosmology operates at the edge of what current instruments can measure, where systematic errors and model assumptions are never trivial. Small discrepancies between independent measurements have historically pointed toward missing physics rather than simple calibration errors, and the ongoing tension in the Hubble constant is a live example of how a persistent disagreement between methods can reshape the theoretical landscape. Each new dataset that approaches this territory with independent systematics adds real information to a problem that has resisted easy resolution for more than a decade. This article has been reviewed according to Science X's editorial process and policies. NASA once bolted Bacillus spores to the outside of a satellite and left them in orbit for nearly six years.

The ones shielded from sunlight were able to come back to life upon returning to Earth. Out in the dirt, bacteria have handed down this spore-forming ability for roughly 3 billion years.

Why would a trait this useful, conserved for 3 billion years, vanish in a few thousand generations. Building the first complete energy budget of forming and sending out a bacterial spore also shows where a spore is most vulnerable, information that could help fight the bacteria.

These data let us price every step of making a spore —copying genetic material, reading genes, assembling proteins, building membranes, into one bill, and a second bill for. The full cycle of forming a spore and then reviving it came to nearly 10 billion ATP molecules, one of the most expensive things a bacterium ever does.

The relevance goes beyond one dataset because even small shifts in measured parameters can matter when the field is testing the limits of the standard cosmological model. The Lambda-CDM framework describes the observable universe with remarkable economy, but its success rests on two components, dark matter and dark energy, whose physical nature remains entirely unknown. Any credible measurement that tightens or loosens the constraints on those components moves the entire theoretical enterprise forward, regardless of whether the immediate result looks dramatic on its own terms.

Moreover, most of that ATP isn't fuel burned outright but an opportunity cost, building blocks that could've become a new cell go instead into the spore's armor and protective. Discover the latest in science, tech, and space with over 100, 000 subscribers who rely on Phys. org for daily insights.

Because this item comes through Phys. org Biology as science journalism, it should be treated as contextual reporting rather than primary evidence. Good science reporting can identify why a result matters, connect it to the wider literature and make technical work readable, but the decisive evidence remains in the original paper, dataset, mission release or technical record. That distinction is especially important when a story is later repeated by aggregators, because repetition increases visibility, not evidential strength.

The next step is to see whether the effect survives when independent surveys, different calibration strategies and tighter control of systematic uncertainties enter the picture. Programmes such as Euclid, DESI and the Rubin Observatory will deliver datasets over the next several years that cover the same parameter space with largely independent methods. If the current signal persists through those tests, its theoretical implications will become impossible to set aside.

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