Plotting their motion required returning to the SWEEPS target region with Hubble two years after the first observations were made.
他们需要策划回到扫运动目标区域用哈伯太空望远镜两年后第一次进行了比较研究。
Plotting their motion required returning to the SWEEPS target region with Hubble two years after the first observations were made.
他们需要策划回到扫运动目标区域用哈伯太空望远镜两年后第一次进行了比较研究。
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