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: This image is a representation of the Cosmic Microwave Background (CMB) Radiation created using data from the Planck satellite. The CMB is the glow left over from when the Universe was approximately 380,000 years old. The early Universe was hot and dense, so the photons from that era were high energy. Due to the expansion of the Universe over 13.8 billion years photons of ""light"" from the early Universe have been stretched to longer wavelengths and are detectable in millimetre wavelengths (microwave region of the electromagnetic spectrum). The ""mottled"" pattern in the image is referred to as anisotropies, and it represents very small temperature fluctuations. These fluctuations correspond to regions of slightly different densities, and are essentially the seeds for larger structure in the Universe e.g.: galaxies, galaxy clusters, and the very first stars. The data from the CMB allows various characteristics of the Universe to be derived, for example, composition, shape, age, and allows for certain predictions to be made about the future evolution of the Universe. The shape of the image is the result of a mapping projection, where the entire sky is mapped onto a single flat oval shape called Molleweide projection. The center of the Milky Way galaxy is located at the centre of the image.
Credit: ESA/Planck Collaboration credit link