He has achieved it by combining James Webb and Hubble

There are images that do not need context to impose themselves. Saturn is one of them. It is enough to see it to understand why it continues to be one of the great protagonists of the solar system: for its shape, for its rings and for that mixture of apparent simplicity and complexity that it hides. The same thing happens to many of us, we stop at any new photograph as if it were the first. And that is somewhat logical, because we do not always have the opportunity to observe it with a such a rich comparison between visible and infrared light nor to get closer, even through an image, to what really happens in its atmosphere.

On this occasion, what NASA has shown It is not simply a new photograph, but a different way of observing the same planet. In a single comparative image (Click to download the image in high definition), the agency has put together an observation from Hubble taken on August 22, 2024 and another from James Webb captured on November 29 of the same year, 14 weeks apart. The result is a double view that seeks not so much to impress as to explain how what we see changes when we observe at different wavelengths.

What are we really seeing in this image?

If we stop at the image, the difference is obvious from the first moment. On the left, the James Webb shows a Saturn with darker, more contrasting tones, where the rings shine brightly because they are made of highly reflective water ice. On the right, Hubble offers a view much closer to how we would perceive it with the naked eye, with soft colors and more subtle bands. According to NASA, both telescopes are observing sunlight reflected by the clouds and mists of the planetbut each one does so in different ranges, which radically changes the information they provide.

On the left, the image of Saturn captured by the James Webb Space Telescope; On the right, the one obtained by the Hubble Space Telescope: two views that reveal its active atmosphere, its moons and its bright rings

Beyond the visual contrast, this comparison allows us to peek into what happens inside Saturn’s atmosphere. The agency explains that by combining both observations, scientists can study the planet at different altitudes, from the deepest clouds to the highest and most diffuse regions. In the Webb image, for example, a long-lasting jet stream known as a “ribbon wave” appears and also a persistent remnant of the great spring storm of 2010 to 2012. Hubble, for its part, provides continuity in monitoring the bands and the general evolution of the planet.

At this point, it is worth clarifying something important: we are not looking at two photographs that reproduce Saturn in the same way. The difference is in how the light is collected and interpreted. Hubble works in the visible spectrum, the same one our eyes perceive, which is why its image is more familiar. James Webb, in this case, observes in the infrared, a radiation invisible to us which allows detecting clouds and compounds at different depths in the atmosphere. In order to display this data, scientists translate these signals into visible colors, and from there come the unnatural tones that appear in your image.

If we move all this to a closer scene, the most reliable reference would be the Hubble image. That is the closest thing to how we would perceive Saturn, with soft tones, not very marked bands and bright but natural rings. But the interesting thing is not to choose between one or the other, but to understand what each look contributes. Webb’s allows us to go beyond the visible and detect processes that would otherwise remain hidden. And it is precisely in that combination where this image gains all its meaning.

Images | POT

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