2.09.2022

NASA Webb’s First Full-Color Images, Data Are Set to Sound

There’s a new, immersive way to explore some of the first full-color infrared images and data from NASA’s James Webb Space Telescope – through sound. Listeners can enter the complex soundscape of the Cosmic Cliffs in the Carina Nebula, explore the contrasting tones of two images that depict the Southern Ring Nebula, and identify the individual data points in a transmission spectrum of hot gas giant exoplanet WASP-96 b. “Music taps into our emotional centers,” said Matt Russo, a musician and physics professor at the University of Toronto. “Our goal is to make Webb’s images and data understandable through sound – helping listeners create their own mental images.”

A team of scientists, musicians, and a member of the blind and visually impaired community worked to adapt Webb’s data, with support from the Webb mission and NASA’s Universe of Learning. 

Webb’s Cosmic Cliffs Sonification

A near-infrared image of the Cosmic Cliffs in the Carina Nebula, captured by NASA’s Webb Telescope, has been mapped to a symphony of sounds. Musicians assigned unique notes to the semi-transparent, gauzy regions and very dense areas of gas and dust in the nebula, culminating in a buzzing soundscape.

The sonification scans the image from left to right. The soundtrack is vibrant and full, representing the detail in this gigantic, gaseous cavity that has the appearance of a mountain range. The gas and dust in the top half of the image are represented in blue hues and windy, drone-like sounds. The bottom half of the image, represented in ruddy shades of orange and red, has a clearer, more melodic composition.

Brighter light in the image is louder. The vertical position of light also dictates the frequency of sound. For example, bright light near the top of the image sounds loud and high, but bright light near the middle is loud and lower pitched. Dimmer, dust-obscured areas that appear lower in the image are represented by lower frequencies and clearer, undistorted notes.

Webb’s Southern Ring Nebula Sonification

NASA’s Webb Telescope uncovered two views of the Southern Ring Nebula – in near-infrared light (at left) and mid-infrared light (at right) – and each has been adapted to sound.

In this sonification, the colors in the images were mapped to pitches of sound – frequencies of light converted directly to frequencies of sound. Near-infrared light is represented by a higher range of frequencies at the beginning of the track. Mid-way through, the notes change, becoming lower overall to reflect that mid-infrared includes longer wavelengths of light.

Listen carefully at 15 seconds and 44 seconds. These notes align with the centers of the near- and mid-infrared images, where the stars at the center of the “action” appear. In the near-infrared image that begins the track, only one star is heard clearly, with a louder clang. In the second half of the track, listeners will hear a low note just before a higher note, which denotes that two stars were detected in mid-infrared light. The lower note represents the redder star that created this nebula, and the second is the star that appears brighter and larger.

Webb’s Exoplanet WASP-96 b Sonification

NASA’s Webb Telescope observed the atmospheric characteristics of the hot gas giant exoplanet WASP-96 b – which contains clear signatures of water – and the resulting transmission spectrum’s individual data points were translated into sound.

The sonification scans the spectrum from left to right. From bottom to top, the y-axis ranges from less to more light blocked. The x-axis ranges from 0.6 microns on the left to 2.8 microns on the right. The pitches of each data point correspond to the frequencies of light each point represents. Longer wavelengths of light have lower frequencies and are heard as lower pitches. The volume indicates the amount of light detected in each data point.

The four water signatures are represented by the sound of water droplets falling. These sounds simplify the data – water is detected as a signature that has multiple data points. The sounds align only to the highest points in the data.

Mapping Data to Sound 

These audio tracks support blind and low-vision listeners first, but are designed to be captivating to anyone who tunes in. “These compositions provide a different way to experience the detailed information in Webb’s first data. Similar to how written descriptions are unique translations of visual images, sonifications also translate the visual images by encoding information, like color, brightness, star locations, or water absorption signatures, as sounds,” said Quyen Hart, a senior education and outreach scientist at the Space Telescope Science Institute in Baltimore, Maryland. “Our teams are committed to ensuring astronomy is accessible to all.”

This project has parallels to the “curb-cut effect,” an accessibility requirement that supports a wide range of pedestrians. “When curbs are cut, they benefit people who use wheelchairs first, but also people who walk with a cane and parents pushing strollers,” explained Kimberly Arcand, a visualization scientist at the Chandra X-ray Center in Cambridge, Massachusetts, who led the initial data sonification project for NASA and now works on it on behalf of NASA’s Universe of Learning. “We hope these sonifications reach an equally broad audience.”

Preliminary results from a survey Arcand led showed that people who are blind or low vision, and people who are sighted, all reported that they learned something about astronomical images by listening. Participants also shared that auditory experiences deeply resonated with them. “Respondents’ reactions varied – from experiencing awe to feeling a bit jumpy,” Arcand continued. “One significant finding was from people who are sighted. They reported that the experience helped them understand how people who are blind or low vision access information differently.”

“One significant finding was from people who are sighted. They reported that the experience helped them understand how people who are blind or low vision access information differently.”

These tracks are not actual sounds recorded in space. Instead, Russo and his collaborator, musician Andrew Santaguida, mapped Webb’s data to sound, carefully composing music to accurately represent details the team would like listeners to focus on. In a way, these sonifications are like modern dance or abstract painting – they convert Webb’s images and data to a new medium to engage and inspire listeners.

Christine Malec, a member of the blind and low vision community who also supports this project, said she experiences the audio tracks with multiple senses. “When I first heard a sonification, it struck me in a visceral, emotional way that I imagine sighted people experience when they look up at the night sky.”

There are other profound benefits to these adaptations. “I want to understand every nuance of sound and every instrument choice, because this is primarily how I’m experiencing the image or data,” Malec continued. Overall, the team hopes that sonifications of Webb’s data help more listeners feel a stronger connection to the universe – and inspire everyone to follow the observatory’s upcoming astronomical discoveries.

The James Webb Space Telescope is the world's premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

These sonifications are a result of a collaboration between the NASA’s Universe of Learning program and the James Webb Space Telescope. The Chandra X-ray Center (CXC) leads data sonification as a NASA’s Universe of Learning partner. Science experts affiliated with the Webb mission provide their expertise on Webb observations, data, and targets.

NASA's Universe of Learning is part of the NASA Science Activation program, from the Science Mission Directorate at NASA Headquarters. The Science Activation program connects NASA science experts, real content and experiences, and community leaders in a way that activates minds and promotes deeper understanding of our world and beyond. Using its direct connection to the science and the experts behind the science, NASA's Universe of Learning provides resources and experiences that enable youth, families, and lifelong learners to explore fundamental questions in science, experience how science is done, and discover the universe for themselves.

NASA's Universe of Learning materials are based upon work supported by NASA under cooperative agreement award number NNX16AC65A to the Space Telescope Science Institute, working in partnership with Caltech/IPAC, Center for Astrophysics | Harvard & Smithsonian, and Jet Propulsion Laboratory.

Quelle: NASA

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Update: 3.09.2022

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NASA’s Webb Takes Its First-Ever Direct Image of Distant World

For the first time, astronomers have used NASA’s James Webb Space Telescope to take a direct image of a planet outside our solar system. The exoplanet is a gas giant, meaning it has no rocky surface and could not be habitable.

The image, as seen through four different light filters, shows how Webb’s powerful infrared gaze can easily capture worlds beyond our solar system, pointing the way to future observations that will reveal more information than ever before about exoplanets.

“This is a transformative moment, not only for Webb but also for astronomy generally,” said Sasha Hinkley, associate professor of physics and astronomy at the University of Exeter in the United Kingdom, who led these observations with a large international collaboration. Webb is an international mission led by NASA in collaboration with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

The exoplanet in Webb’s image, called HIP 65426 b, is about six to 12 times the mass of Jupiter, and these observations could help narrow that down even further. It is young as planets go — about 15 to 20 million years old, compared to our 4.5-billion-year-old Earth.

Astronomers discovered the planet in 2017 using the SPHERE instrument on the European Southern Observatory’s Very Large Telescope in Chile and took images of it using short infrared wavelengths of light. Webb’s view, at longer infrared wavelengths, reveals new details that ground-based telescopes would not be able to detect because of the intrinsic infrared glow of Earth’s atmosphere.

Researchers have been analyzing the data from these observations and are preparing a paper they will submit to journals for peer review. But Webb’s first capture of an exoplanet already hints at future possibilities for studying distant worlds.

Since HIP 65426 b is about 100 times farther from its host star than Earth is from the Sun, it is sufficiently distant from the star that Webb can easily separate the planet from the star in the image.

Webb’s Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI) are both equipped with coronagraphs, which are sets of tiny masks that block out starlight, enabling Webb to take direct images of certain exoplanets like this one. NASA’s Nancy Grace Roman Space Telescope, slated to launch later this decade, will demonstrate an even more advanced coronagraph.

“It was really impressive how well the Webb coronagraphs worked to suppress the light of the host star,” Hinkley said.

Taking direct images of exoplanets is challenging because stars are so much brighter than planets. The HIP 65426 b planet is more than 10,000 times fainter than its host star in the near-infrared, and a few thousand times fainter in the mid-infrared.

In each filter image, the planet appears as a slightly differently shaped blob of light. That is because of the particulars of Webb’s optical system and how it translates light through the different optics.

“Obtaining this image felt like digging for space treasure,” said Aarynn Carter, a postdoctoral researcher at the University of California, Santa Cruz, who led the analysis of the images. “At first all I could see was light from the star, but with careful image processing I was able to remove that light and uncover the planet.”

While this is not the first direct image of an exoplanet taken from space – the Hubble Space Telescope has captured direct exoplanet images previously – HIP 65426 b points the way forward for Webb’s exoplanet exploration.

“I think what’s most exciting is that we’ve only just begun,” Carter said. “There are many more images of exoplanets to come that will shape our overall understanding of their physics, chemistry, and formation. We may even discover previously unknown planets, too.”

Quelle: NASA 

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Update: 6.09.2022

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Stunningly perfect 'Einstein ring' captured by James Webb Space Telescope