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At last astronomers have solved the mystery of the rings encircling the planet Saturn.最后天文学家解开了土星光环之谜。Some astronomers have posited that the universe is made up of mysterious dark matter.一些天文学家提出了假设，认为宇宙是由神秘的暗物质构成的。Early astronomers thought that our planet was the centre of the universe.早期的天文学家认为我们的星球是宇宙的中心。Several astronomers noted that the star's pulsations seemed less pronounced.一些天文学家注意到恒星的脉动似乎不那么明显了。Space scientists and astronomers have taken another step forwards.航天科学家和天文学家又取得了进展。Space scientists and astronomers have taken another step forwards.航天科学家与天文学家又向前迈进了一步。By measuring the motion of the galaxies in a cluster, astronomers can infer the cluster's mass.通过测量星团中星系的运动，天文学家可以推断出该星团的质量。The Hubble Space Telescope allows astronomers to form a more accurate picture of our solar system.哈勃太空望远镜使天文学家能够对我们所处的太阳系产生更为准确的图像。 |