NASA OSIRIS-REx任务的科学家最近了解到，小行星表面再生的速度要比地球快得多。通过分析OSIRIS-REx航天器拍摄的高分辨率图像，研究团队发现，太阳的热量在短短1万到10万年内就将小行星贝努上的岩石断裂。这些信息将有助于科学家估计像贝努这样的小行星上的巨石分解成更小的颗粒需要多长时间，这些颗粒可能会喷射到太空中，也可能留在小行星表面。 数万年听起来可能相当缓慢，但“我们认为小行星表面再生需要数百万年，”马尔科·德尔博说，他是法国蔚蓝海岸大学、法国国家科研中心、法国蔚蓝海岸天文台、实验室的高级科学家，也是2022年6月在《自然地球科学》上发表的一篇论文的主要作者。“我们惊讶地获悉， […]
2022年7月24日 Saturn in Infrared from Cassini Image Credit: NASA, JPL-Caltech, SSI; Processing: Maksim Kakitsev Explanation: Many details of Saturn appear clearly in infrared light. Bands of clouds show great structure, including long stretching storms. Also quite striking in infrared is the unusual he
一旦卫星进入轨道，SWOT任务不仅将定期监测像俄勒冈州威拉米特这样的强大河流（如图），而且还将监测直径至少330英尺(100米)的小河流。 影像来源：美国能源部 地表水和海洋地形任务将对地球上95%以上的湖泊、河流和水库进行测量。 水就是生命，但尽管水很重要，但人类对地球淡水体的看法却出奇地有限。研究人员对全球仅有的几千个湖泊进行了可靠的水位测量，而地球上一些重要的河流系统几乎没有数据。即将到来的地表水和海洋地形（SWOT）卫星将填补这一巨大空白。通过帮助人们更好地了解地球的水循环，它将有助于更好地管理水资源，并扩大对气候变化如何影响湖泊、河流和水库的知识。 由NASA和法国航天局国家空间研究
We’re celebrating 50 years of the Landsat satellite, the first of which launched on July 23, 1972. The latest in the series, Landsat 9, launched in September 2021. Landsat shows us Earth from space. For 50 years, the mission has collected data on the forests, farms, urban areas and freshwater
2022年7月23日 Apollo 11 Landing Panorama Neil Armstrong, Apollo 11, NASA Explanation: Have you seen a panorama from another world lately? Assembled from high-resolution scans of the original film frames, this one sweeps across the magnificent desolation of the Apollo 11 landing site on the Moon’s
2022年7月22日 Spiral Galaxy M74: A Sharper View Image Credit: NASA, ESA, CSA, STScI; Processing Copyright: Robert Eder Explanation: Beautiful spiral galaxy Messier 74 (also known as NGC 628) lies some 32 million light-years away toward the constellation Pisces. An island universe of about 100 billion s
An Alta-X drone operated by NASA researchers flies over NASA Langley’s City Environment Range Testing for Autonomous Integrated Navigation (CERTAIN) as part of the Advanced Air Mobility project’s High Density Vertiplex (HDV) testing in April 2022. HDV is developing the necessary systems to ena
2022年7月21日 Messier 10 and Comet Image Credit & Copyright: German Penelas Perez Explanation: Imaged on July 15 2022, comet C/2017 K2 (PanSTARRS) had a Messier moment, sharing this wide telescopic field of view with globular star cluster Messier 10. Of course M10 was cataloged by 18th century com
The Apollo 11 crew simulates deploying and using lunar tools on the surface of the Moon during a training exercise on April 22, 1969. Lunar module pilot Buzz Aldrin (left) uses a scoop and tongs to pick up a soil sample. Mission Commander Neil Armstrong holds a bag to receive the sample. In the back
2022年7月20日 Jupiter and Ring in Infrared from Webb Image Credit: NASA, ESA, CSA, STScI; Processing & License: Judy Schmidt Explanation: Why does Jupiter have rings? Jupiter’s main ring was discovered in 1979 by NASA’s passing Voyager 1 spacecraft, but its origin was then a mystery. D
