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Loading contentEinstein's result that mass and energy are two forms of the same thing, related by the speed of light squared. It is the accounting behind starlight: fusing hydrogen into helium in the Sun's core converts about four million tonnes of mass into energy every second, and it governs the annihilation of matter with antimatter.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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