HST Frontier Fields clusters

Extending over three Hubble Space Telescope (HST) cycles, the Hubble Frontier Fields (HFF) initiative constitutes the largest commitment ever of HST time to the exploration of...

哈勃前沿场计划（Hubble Frontier Fields, HFF）历时三个哈勃空间望远镜（Hubble Space Telescope, HST）观测周期，是哈勃空间望远镜有史以来将最多观测时长投入于……探索领域的最大型项目。