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blue? Why does firefly glow? I found many scientific principles and solved the mystery in my heart. One of the articles that interests me is “why fireflies emit light”. The luminescence of fireflies is related to the luminous device at its tail, which contains luciferase luminous substances. When air enters the illuminator, luciferin bines with oxygen in the air under the catalysis of luciferase, and the generated energy is converted into fluorescence. The more air entering the illuminator, the brighter the fluorescence. It can be seen that fireflies do not emit light at night, but their brightness is not as bright as that of the sun, so they do not emit light during the day. Previously, I didn’t know the nine planets and the Milky way at all. 100000 whys introduced us to the formation process of celestial bodies. I know the nine planets of Venus, Saturn, Mars and the earth, while the Milky way is posed of many nebulae like the solar system. The earth we live on is just a “l(fā)ittle star” in the universe. Whenever I open the book “100000 whys”, I feel like entering a magical world. There are many interesting questions, seemingly simple but with profound secrets. “100000 whys” is a popular science series, which covers everything from the universe to the trivial things of life. Every short and concise article will bring? Interesting scientific knowledge. It can not only increase my knowledge and broaden my horiz