韦伯: 木星与木星环的红外光图像

韦伯: 木星与木星环的红外光图像

ByNASA中文

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. Data from NASA’s Galileo spacecraft that orbited Jupiter from 1995 to 2003, however, confirmed the hypothesis that this ring was created by meteoroid impacts on small nearby moons. As a small meteoroid strikes tiny Metis, for example, it will bore into the moon, vaporize, and explode dirt and dust off into a Jovian orbit. The featured image of Jupiter in infrared light by the James Webb Space Telescope shows not only Jupiter and its clouds, but this ring as well….

韦伯、哈伯与昴宿的斯蒂芬五重星系

韦伯、哈伯与昴宿的斯蒂芬五重星系

ByNASA中文

2022年7月18日 Stephan’s Quintet from Webb, Hubble, and Subaru Image Credit: Webb, Hubble, Subaru; NASA, ESA, CSA, NOAJ, STScI; Processing & Copyright: Robert Gendler Explanation: OK, but why can’t you combine images from Webb and Hubble? You can, and today’s featured image shows one impressive result. Although the recently launched James Webb Space Telescope (Webb) has a larger mirror than Hubble, it specializes in infrared light and can’t see blue — only up to about orange. Conversely, the Hubble Space Telescope (Hubble) has a smaller mirror than Webb and can’t see as far into the infrared as Webb, but can image not only blue light but even ultraviolet. Therefore, Webb and Hubble data can be combined to create images across a wider variety of colors. The…

2MASS J17554042+6551277

2MASS J17554042+6551277

ByNASA中文

2022年3月19日 2MASS J17554042+6551277 Image Credit : NASA, STScI, JWST Explanation: 2MASS J17554042+6551277 doesn’t exactly roll off the tongue but that’s the name, a coordinate-based catalog designation, of the star centered in this sharp field of view. Fans of the distant universe should get used to its spiky appearance though. The diffraction pattern is created by the 18 hexagonal mirror segments of the James Webb Space Telescope. After unfolding, the segments have now been adjusted to achieve a diffraction limited alignment at infrared wavelengths while operating in concert as a single 6.5 meter diameter primary mirror. The resulting image taken by Webb’s NIRcam demonstrates their precise alignment is the best physics will allow. 2MASS J17554042+6551277 is about 2,000 light-years away and well within our own galaxy….

前往L2点途中的詹姆斯·韦伯太空望远镜

前往L2点途中的詹姆斯·韦伯太空望远镜

ByNASA中文

2021年12月31日 JWST on the Road to L2 Image Credit & Copyright: Malcolm Park (North York Astronomical Association) Explanation: This timelapse gif tracks the James Webb Space Telescope as it streaks across the stars of Orion on its journey to a destination beyond the Moon. Recorded on December 28, 12 consecutive exposures each 10 minutes long were aligned and combined with a subsequent color image of the background stars to create the animation. About 2.5 days after its December 25 launch, JWST cruised past the altitude of the Moon’s orbit as it climbed up the gravity ridge from Earth to reach a halo orbit around L2, an Earth-Sun Lagrange point. Lagrange points are convenient locations in space where the combined gravitational attraction of one massive body…

詹姆斯·韦伯太空望远镜发射烟尘后方的李奥纳德彗星

詹姆斯·韦伯太空望远镜发射烟尘后方的李奥纳德彗星

ByNASA中文

2021年12月27日 Comet Leonard behind JWST Launch Plume Image Credit & Copyright: Matipon Tangmatitham (NARIT) Explanation: Which one of these two streaks is a comet? Although they both have comet-like features, the lower streak is the only real comet. This lower streak shows the coma and tail of Comet Leonard, a city-sized block of rocky ice that is passing through the inner Solar System as it continues its looping orbit around the Sun. Comet Leonard has recently passed its closest to both the Earth and Venus and will round the Sun next week. The comet, still visible to the unaided eye, has developed a long and changing tail in recent weeks. In contrast, the upper streak is the launch plume of the Ariane V rocket that…

地球上空的詹姆斯·韦伯太空望远镜

地球上空的詹姆斯·韦伯太空望远镜

ByNASA中文

2021年12月26日 James Webb Space Telescope over Earth Image Credit: Arianespace, ESA, NASA, CSA, CNES Explanation: There’s a big new telescope in space. This one, the James Webb Space Telescope (JWST), not only has a mirror over five times larger than Hubble’s in area, but can see better in infrared light. The featured picture shows JWST high above the Earth just after being released by the upper stage of an Ariane V rocket, launched yesterday from French Guiana. Over the next month, JWST will move out near the Sun-Earth L2 point where it will co-orbit the Sun with the Earth. During this time and for the next five months, JWST will unravel its segmented mirror and an array of sophisticated scientific instruments — and test them….