Why is there sometimes a green flash at sunset and sunrise?

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Why is there sometimes a green flash at sunset and sunrise?
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Alice Sun is a science journalist based in Brooklyn. She covers a wide range of topics, including ecology, neuroscience, social science and technology. Her work has appeared in Audubon, Sierra, Inverse and more. For her bachelor's degree, she studied environmental biology at McGill University in Canada.

As the sun dips below the horizon and the light starts to dim, lucky observers may spot a rare, brief flash of emerald. This is the"green flash," which can sometimes be seen right after sunset or before sunrise. Like many colorful spectacles in the sky, such as rainbows, the green flash is the result of sunlight being separated into different colors.

Most green flashes fall into two categories. One type occurs just before the sun disappears. This is the one referenced in Jules Verne's novel"The Green Ray," Null said. But the type Null sees more often is when the sun is still above the water."You get this light off the top of the disk," he said.How to see the green flashFor the best chances of seeing this verdant flash, the right conditions need to align.

By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.Whether green is visible also"depends on what stuff there is in the atmosphere," Courtial said. Particles can scatter blue and purple light, making green light more apparent. Courtial demonstrated this in a simple experiment: by adding milk powder to a tank full of water and then shining a white bike light into it.

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