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美国太空总署（NASA）本周在夏威夷檀香山举行的美国天文学会年度大会中宣布，发现一颗和地球一般大小的行星“TOI 700 d”，位于宿主恒星的可居住范围内，容许液态水存在，且距离地球仅101.5光年。

NASA天文物理部门主任赫茨指出，这是通过凌日系外行星巡天卫星（TESS）的任务而发现，该项目是在于寻找和地球一般大小、绕行宿主恒星的行星。TESS起初将宿主恒星TOI 700分类错误，后来被包括高中生史宾塞在内的业余天文学者纠正。修正恒星体积后，行星的大小也跟著下修，接著发现最远的一颗行星体积和地球一般大，且位于可居住区域。这项发现后来经由史匹哲太空望远镜（Spitzer Space Telescope）证实。

作为主恒星的TOI 700体积不大，约太阳的40％，表面温度只有太阳的一半。TESS在轨道上发现三枚行星，分别命名为TOI 700 b、c和d，其中只有d位于所谓的可居住区域，允许液态水存在，仅比地球还大20%，公转周期为37天。这是2018年发射的TESS首次发现类似行星。

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