哈勃空间望远镜太空图
作者： NASA/ESA 来源：http://www.ngpod.cn 《国家地理》杂志壁纸
The Messier 101, or Pinwheel, galaxy spins in pixel perfection in the most detailed portrait of a galaxy ever released by Hubble scientists. The image was produced by combining exposures taken by Hubble with others from ground-based telescopes.
