Examining the earth, we can make the list of the "essential factors for life" a long as we please. The American astronomer Hugh Ross has made a list of his own: Surface Gravity; Distance From Parent Star; Thickness of crust; Rotation period; Gravitational interaction with moon; Magnetic Field; Albedo (Ratio of Reflected light to total amount falling on surface); Oxygen to nitrogen ratio in the atmosphere; Carbon dioxide and water vapour levels in atmosphere; Ozone level in Atmosphere; Seismic Activity;
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