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Nasa's Webb telescope captures clearest image of Neptune in decades
The James Webb space telescope has captured an image of a luminous Neptune and its delicate rings, located 30 times farther from the Sun than Earth, in detail not seen in decades.
“It has been three decades since we last saw these faint, dusty rings, and this is the first time we’ve seen them in the infrared," said Heidi Hammel in a NASA release, a Neptune system expert and interdisciplinary scientist for Webb.
Webb’s unmatched infrared imaging capability has given a new glimpse into Neptune’s atmosphere, said Mark McCaughrean, a senior adviser for science and exploration at the European Space Agency who has worked for more than 20 years at the Webb project.
The telescope “takes all that glare and background away” in a way “we can start to tease out the atmospheric composition” of the planet, McCaughrean added.
In images the Hubble space telescope took previously, Neptune seems as deep blue due to methane in its atmosphere. However, Webb’s primary imager NIRCam captured near-infrared wavelengths that show the planet as greyish white, with icy clouds streaking the surface.
“The rings are more reflective in the infrared,” McCaughrean said, “so they’re much easier to see.”
In the new image, an “intriguing brightness” can be seen near the top of Neptune, NASA said in a statement. Seven of Neptune’s 14 known moons were also spotted by Webb. What appears to be a very bright star looms over Neptune, but it is in fact Triton, the planet's strange, huge moon haloed with Webb’s famed diffraction spikes.
Triton is larger than dwarf planet Pluto, and due to being covered in ice, it appears brighter than Neptune. Meanwhile Neptune “absorbs most of the light falling on it”, McCaughrean said.
Webb has been operational since July and is the most powerful telescope ever built. It has already revealed significant unprecedented information and scientists hope it will herald a new era of discovery.
“The kind of astronomy we’re seeing now was unimaginable five years ago,” McCaughrean said.
“Of course, we knew that it would do this, we built it to do this, it is exactly the machine we designed. But to suddenly start seeing things in these longer wavelengths, which were impossible before … it’s just absolutely remarkable.”