Bluesky is the latest app users are flocking to in an effort to replace X. We answer all your questions about the social ...

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Stefan Kim of SciShow explains why the sky appears blue to human eyes due to Rayleigh Scattering, the scattering of light by particles that are much smaller than the wavelength of radiation.

new video loaded: A Curious Blue Swirl of Light Captivates Sky Watchers in Europe The Met Office, Britain’s weather service, said the light was most likely caused by a SpaceX rocket launch.