There are 9 planets in our solar system besides the earth.这句话是否正确?

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There are 9 planets in our solar system besides the earth.这句话是否正确?

There are 9 planets in our solar system besides the earth.这句话是否正确?
There are 9 planets in our solar system besides the earth.这句话是否正确?

There are 9 planets in our solar system besides the earth.这句话是否正确?
语法上正确,但在科学上不正确.因为太阳系已经变成了8大行星了.2006年8月24日,国际天文学联合会开会把冥王星给开除了.
资料:
国际天文学联合会大会放弃将冥王星之外的太阳系八大行星称为“经典行星”的说法,从而确认太阳系只有8颗行星,冥王星被降级为入“矮行星”.此前盛传的第一种方案中提出了太阳系另外增加3颗二级行星的计划流产.
数十年来,科学家普遍认为太阳系有九大行星,但随着一颗比冥王星更大、更远的天体的发现,使得冥王星大行星地位的争论愈演愈烈.一是由于其发现的过程是基于一个错误的理论;二是由于当初将其质量估算错了,误将其纳入到了大行星的行列.因此在国际天文学联合会大会上,是否要给冥王星“正名”成为了大会的焦点,为此,天文学家给出了各种方案.
1930年美国天文学家汤博发现冥王星,当时错估了冥王星的质量,以为冥王星比地球还大,所以命名为大行星.然而,经过近30年的进一步观测,发现它的直径只有2300公里,比月球还要小,等到冥王星的大小被确认,“冥王星是大行星”早已被写入教科书,以后也就将错就错了.
冥王星是目前太阳系中最远的行星,其轨道最扁.冥王星的质量远比其他行星小,甚至在卫星世界中它也只能排在第七、第八位左右.冥王星的表面温度很低,因而它上面绝大多数物质只能是固态或液态.
行星定义委员会最初提出的方案,在确定金星、土星、木星、水星、地球、火星、天王星、海王星为经典行星之外,将冥王星降格为二级行星,同时增加谷神星、卡戎星和2003UB313为二级行星.(

our --> the . 9-->8冥王星已不是行星 另外,besides 用得很对,没有问题

这句话不对. 现在应该是8颗行星,冥王星已不是行星了.因此这里"除地球外... "把9改成7."有7颗行星.(去年以前是9颗行星,这里也应改成8.)

9-->8

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