Corona can be different things depending if you’re looking at biology or physics 😃. In both cases “corona” means crown 👑. In biology, there are coronaviruses (like the one which causes COVID-19) which look like balls with spikes on them. In physics (mainly astrophysics – talking about space) it means the outside layers of a star, like the sun ☀ – again, it’s a big ball with spikes on, which looks a bit like a crown! 👑😁
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