哈勃空间望远镜的一个独特能力是可以观测到可达100纳米的远紫外范围。由于地球的大气在很大程度上阻挡了紫外线到达地面，只有空间望远镜才能有效地观测到紫外辐射。空间望远镜研究所的任务负责人汤姆·布朗说：“很多天文现象的温度和化学诊断信息都在紫外波段。” ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...