美国天文学家宣布,他们首次观察到太阳系以外的一颗行星投在其恒星上的阴影。该恒星距离地球约153光年,其年龄及大小和太阳相类似。在11月7日和11日的观察中,科学家们发现一行星在其恒星前经过时投下阴影,并推断出该行星围绕其恒星一周需要3.523日。根据投下的影子,科学家们估计该行星是个由气体组成的球状物。】 American astronomers announced that they first observed the shadow of a planet outside the solar system thrown on their star. The star is about 153 light-years away from Earth, and its age and size are similar to those of the Sun. In observations on November 7 and 11, scientists discovered that a planet cast a shadow in front of its star and concluded that it takes 3.523 days for the planet to orbit its star. According to the shadow cast, scientists estimate that the planet is a gas-ball. 】