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Tiny grains tell a stellar story

Imagine a grain of fine beach sand. What’s its size? Classification scales vary, but let’s say less than a tenth (0.1) of a millmeter (mm). A grain of table salt. Same question. Maybe ~0.3 mm. In either grain there are a gazillion molecules. Now imagine something a thousand (1000) times smaller – a micrometer-sized grain.… Continue reading Tiny grains tell a stellar story