保护地球，探索宇宙，发现文明
2023年11月29日 A Landspout Tornado over Kansas Image Credit & Copyright: Brad Hannon Explanation: Could there be a tornado inside another tornado? In general, no. OK, but could there be a tornado inside a wider dust devil? No again, for one reason because tornados comes down from the sky, but dust devils rise up from the ground. What is pictured is a lands...
这张来自NASA/ESA/CSA詹姆斯·韦伯太空望远镜拍摄的本月新照片揭示了赫比格-哈罗天体797（HH 797）的复杂细节。赫比格-哈罗天体是新生恒星（被称为原恒星）周围的发光区域，由这些新生恒星喷出的恒星风或气体喷流形成激波，与附近的气体和尘埃高速碰撞时形成。HH 797占据了图像的下半部分，它位于年轻的疏散星团IC 348附近，IC 348位于英仙座暗云复合体的东部边缘附近。图像上方明亮的红外物体被认为是另外两颗原恒星的宿主。 这张照片是由韦伯的近红外相机（NIRCam）拍摄。红外成像在研究新生恒星及其外流方面非常强大，因为最年轻的恒星总是镶嵌在形成它们的气体和尘埃中。恒星外流的红外辐射穿透了遮蔽的气体和尘埃，使赫比格-哈罗天体成为韦伯灵敏红外仪器观测的理想对象。在湍流条件下被激发的分子，包括氢分子和一氧...
A model of the Mariner-C spacecraft seems to float in the darkness of space in this photo from a June 1964 Conference on New Technology at NASA’s Glenn Research Center in Cleveland. Mariner-C and Mariner-D were identical spacecraft designed by NASA’s Jet Propulsion Laboratory to fly by Mars and photograph the Martian surface. Mariner-C was launched on Nov. 4...
2023年11月28日 Ganymede from Juno Image Credit & Copyright: NASA/JPL-Caltech/SwRI/MSSS; Processing & License: Kevin M. Gill; Explanation: What does the largest moon in the Solar System look like? Jupiter‘s moon Ganymede, larger than even Mercury and Pluto, has an icy surface speckled with bright young craters overlying a mixture of older, darker...
工程师们将超越地球的尽头，为未来的火星直升机寻找更强的性能。
The spectacular aurora borealis, or the “northern lights,” over Canada is sighted from the space station near the highest point of its orbital path. The station’s main solar arrays are seen in the left foreground. Image Credit: NASA 从轨道最高点附近的空间站可以看到加拿大上空壮观的北极光。空间站的主要太阳能电池阵列在左侧前景。 图片来源: NASA
2023年11月27日 LBN 86: The Eagle Ray Nebula Image Credit & Copyright: Vikas Chander Explanation: This eagle ray glides across a cosmic sea. Officially cataloged as SH2-63 and LBN 86, the dark nebula is composed of gas and dust that just happens to appear shaped like a common ocean fish. The interstellar dust nebula appears light brown as it blocks and redd...
A disk of hot gas swirls around a black hole in this illustration from Dec. 20, 2022. A long stream of hot gas on the right, coming from a star that was pulled apart by the black hole, feeds into the disk. Image Credit: NASA/JPL-Caltech 在2022年12月20日的这幅插图中，一个热气盘围绕着一个黑洞旋转。右边是一条长长的热气流，来自一颗被黑洞撕裂的恒星，流入吸积盘。 影像来源：NASA/JPL-Caltech
2023年11月26日 A Dust Jet from the Surface of Comet 67P Image Credit: ESA, Rosetta, MPS, OSIRIS; UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA Explanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. In 2016, though, ESA’s Rosetta spacecraft not only imaged a jet emerging fro...
2023年11月25日 Little Planet Aurora Image Credit & Copyright: Victor Lima Explanation: Immersed in an eerie greenish light, this rugged little planet appears to be home to stunning water falls and an impossibly tall mountain. It’s planet Earth of course. On the night of November 9 the nadir-centered 360 degree mosaic was captured by digital camera fr...