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A mysterious signal around Earth could be dark matter
Scientists used Earth’s magnetic field and atmosphere as a planet-sized detector to search for some of the lightest proposed forms of dark matter.
Summary
Dark matter is one of the biggest unsolved mysteries in modern physics. Astronomers are highly confident that it exists and estimate that it accounts for about a quarter of the universe's total energy content, yet scientists still do not know what it is made of. Two leading possibilities are hypothetical particles known as ultralight axions and dark photons .
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