>有什么共识关于地球引力的猜想可能大幅改变了地质时间;不,地球引力没有显著变化。是的,地球的质量增加,因为陨石和减少损失,因为一些大气的气体空间,但它是非常微不足道的[1]。>,特别是与生物大灭绝有关定期增加如KPg边界?不。没有证据表明任何定期的增加或减少,伴随着大规模物种灭绝。>为例,将在大气气体的成分转换支持的优势,较轻的气体(如氮)和水重气体(氧气、二氧化碳地球质量大约是6×10 <一口> 24 < /一口>。大气的质量大约是6×10 <一口> 18 < /一口>。大气的质量是一个*一百万*整个地球的质量。任何变化将是绝对可以忽略不计在考虑地球的总重力的影响。 > Possibly the asteroid veered into Earth as a result of such an increase; Just as a change in gravity can deflect an asteroid's trajectory to earth, it could deflect an asteroid's trajectory that was going to hit earth anyway, *away* from earth. Big planets like Jupiter get hit more not only because of their greater gravity, but simply because they're a much bigger target. [1]: //www.hoelymoley.com/a/4481/725