Without an atmosphere, Earth would be subject to extreme temperature fluctuations, as there would be no protective layer to regulate heat and cold. The lack of atmosphere would also lead to the absence of oxygen, making it impossible for humans and other living organisms to survive. Additionally, without an atmosphere to block harmful solar radiation, the surface of the Earth would be bombarded with dangerous levels of UV radiation, making it inhospitable for life. Overall, Earth without an atmosphere would be a barren and uninhabitable planet.
