Caption: 這幅令人驚嘆的圖像被稱為 "哈勃極深視場"（HUDF），是利用哈勃空間望遠鏡（HST），通過合併 HST 400 軌、 800 次曝光（相當於 11.3 天的總曝光時間）拍攝獲得的。 其中顯示了近 10,000 個星系，拍攝方向是視野中銀河系恆星數量最少的一片天空。HST 觀測到的天空區域相當於滿月在天球中大小的 1/10，大致相當於 1 米外約 1 毫米左右的物體。 除了圖片中間十字準線上的亮點之外，圖像中的每個物體都是星系。由於光速在真空中是一個常數，因此距離越遠的物體，我們觀測到的時間就越久遠。因此，哈勃極深場中一些星系發出的光來自宇宙只有幾億年歷史的時候。哈勃極深場引領我們進行了一次時空之旅。
Credit: NASA, ESA, and S. Beckwith (STScI) and HUDF Team credit link

Caption: 這張圖片展示了兩顆相互作用的漩渦星系，它們距離地球大約1.5億光年。兩顆漩渦星系在引力的牽引下“共舞”，使得它們的旋臂出現了明顯的扭曲。這幅圖像中所展現的“擁抱”，最終將以兩個星系合併為一個星系而結束，極有可能形成一個橢圓星系。
Credit: 歐空局 credit link

Caption: 由於這個著名的星系M104 與墨西哥帽子非常相似，因此經常被稱為 "草帽星系"。之所以，看起來是這個樣子，是由於我們觀測的視角幾乎平行著薄圓盤的平面，圓盤被星系中的隆起（bulge）所照亮。星系盤和隆起都含有恆星，但隆起中的恆星往往比較老。星系盤中藏有大量的塵埃和氣體，從而形成了陰影。M104 位於室女座，距離我們大約 50 光年。圖中可見的小點有些是前景恆星，有些是背景星系，但實際上大部分都是球狀星團，它們是與草帽星系相關的緻密大質量恆星團。
Credit: ESO/P.巴特爾 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 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