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Cloud Dec, 2018

A cloud can block sunlight and still shine by scattering and reflecting light. When sunlight hits a cloud, some of the light is absorbed, casting a shadow on the ground below. However, clouds are composed of tiny water droplets or ice crystals that scatter and reflect sunlight in all directions. This scattering diffuses the light, making the cloud appear bright and often glowing, even as it casts a shadow. The cloud's edges can also refract light, creating a halo effect, further enhancing its luminous appearance while blocking direct sunlight.

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