Caption: 这幅令人惊叹的图像被称为 "哈勃极深视场"（HUDF），是利用哈勃空间望远镜（HST），通过合并 HST 400 轨、 800 次曝光（相当于 11.3 天的总曝光时间）拍摄获得的。 其中显示了近 10,000 个星系，拍摄方向是视野中银河系恒星数量最少的一片天空。HST 观测到的天空区域相当于满月在天球中大小的 1/10，大致相当于 1 米外约 1 毫米左右的物体。 除了图片中间十字准线上的亮点之外，图像中的每个物体都是星系。由于光速在真空中是一个常数，因此距离越远的物体，我们观测到的时间就越久远。因此，哈勃极深场中一些星系发出的光来自宇宙只有几亿年历史的时候。哈勃极深场引领我们进行了一次时空之旅。
Credit: NASA, ESA, and S. Beckwith (STScI) and HUDF Team credit link

Caption: 这张图片展示了两颗相互作用的漩涡星系，它们距离地球大约1.5亿光年。两颗漩涡星系在引力的牵引下“共舞”，使得它们的旋臂出现了明显的扭曲。这幅图像中所展现的“拥抱”，最终将以两个星系合并为一个星系而结束，极有可能形成一个椭圆星系。
Credit: 欧空局 credit link

Caption: 由于这个著名的星系M104 与墨西哥帽子非常相似，因此经常被称为 "草帽星系"。它之所以看起来是这个样子，是由于我们观测的视角几乎平行于薄盘的平面，薄盘/星系盘 被星系的核球所照亮。星系盘和核球都含有恒星，但核球中的恒星往往比较老。星系盘中蕴含有大量的尘埃和气体，从而形成了阴影。M104 位于室女座，距离我们大约 50 光年。图中可见的小点有些是前景恒星，有些是背景星系，但实际上大部分都是球状星团，它们是与草帽星系相关的致密大质量恒星团。
Credit: ESO/P.巴特尔 credit link

Caption: The zodiac constellation Leo and its surrounding constellations. Starting from the top of the diagram and going clockwise, these are Leo Minor, Cancer, Sextans, Hydra, Crater, Virgo and Ursa Major. The brightest star in Leo, Regulus, lies almost exactly on the ecliptic (shown here as a blue line): the path the Sun appears to take across the sky over the course of a year. The Sun spends the period from mid August to mid September in Leo. The other planets in the Solar System can often be found in Leo. Leo spans the celestial equator and is thus part of it is visible at some time in the year from all of planet Earth with some of the constellation obscured for the most arctic and antarctic regions of the world. Leo is most visible in the evenings in the northern hemisphere spring and southern hemisphere autumn. Several objects can be seen in Leo, including M65 and M66 – two galaxies in the Leo Triplet, a trio of galaxies including NGC 3628, not listed here. In addition, M96, a spiral galaxy, can be seen as a fuzzy object using a small telescope, and Messier 105, an elliptical galaxy. Each of these objects are labelled on the map as red ellipses. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labelled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
Credit: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope