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Regardless of the amount of winter ice cover, the waters off of the Alaskan coast usually come alive each spring with blooms of phytoplankton. These blooms can form striking patterns of blue and green seawater, such as those visible in this image of the Chukchi Sea acquired on June 18, 2018, by the Operational Land Imager (OLI) on Landsat 8.
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Launched nearly 15 years ago on August 25, 2003, the Spitzer Space Telescope is the final mission in NASA’s Great Observatories Program – a family of four space-based observatories, each observing the universe in a different kind of light. The other missions in the program include the visible-light Hubble Space Telescope, Compton Gamma-Ray Observatory, and the Chandra X-Ray Observatory.
Spitzer太空望远镜于大约15年前的2003年08月25日发射升空，这是NASA伟大天文台计划的最后一个任务，这个任务的大家庭包含4个太空望远镜，每个观测站以不同的波段观测着宇宙。该计划中的其他成员包括：工作在可见光波段的哈勃太空望远镜，Compton伽玛射线天文台以及Chandra X 射线天文台。
If you have ever seen a series of concentric rings of color near a mist or fog, you have likely seen a glory. This colorful optical phenomenon, bright red on the outside and blue toward the center, forms when water droplets scatter sunlight back toward a source of light.