The Martian atmosphere used to be a lot thicker in the past and may have been lost due to meteor bombardment. Retaining an atmosphere is more complicated than gravity--for example, Venus has much less mass than earth but its atmosphere is much thicker.
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The Martian atmosphere used to be a lot thicker in the past and may have been lost due to meteor bombardment. Retaining an atmosphere is more complicated than gravity--for example, Venus has much less mass than earth but it's atmosphere is much thicker.
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