A forgotten window in physics suggests that dark matter might be hiding where our existing sensors can already see it.

Axions are a leading candidate for dark matter, but many mass ranges have already been ruled out by supernova data. This re-evaluation shows that a specific mass range called the Turner window is actually still wide open. Existing sodium iodide detectors, which are already built for other experiments, are perfectly tuned to find these particles. We might not need to build a new multi-billion dollar machine to find the missing mass of the universe. This suggests the answer to dark matter could be sitting in data we are already collecting.