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NASA's Webb Captures Neptune's Auroras For First Time

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March 26, 2025 6:00AM (EDT)Release ID: 2025-104
A two-panel horizontal image. On the left is Neptune, as seen from the Hubble Space Telescope. It is a blue circle, tilted about 25 degrees to the left. There are white smudges at 7 o’clock and just above 5 o’clock. At the right is an opposing view of the planet, using data from Hubble and Webb. It is a multi-hued blue orb. There are white smudges in the same spots as the image on the left, but also at the center of the planet and at the top. There are cyan smudges vertically along the right side, with the top of the smudging more translucent than the bottom.

Summary

Long-sought auroral glow finally emerges under Webb’s powerful gaze.

Neptune lies in the frigid, dark, vast frontier of the outer edges of our solar system about 3 billion miles away from the Sun.

It’s only been visited once by a spacecraft back in 1989, and since then, observatories like NASA’s Hubble Space Telescope have tracked the planet’s changing weather. Hubble even discovered a new moon orbiting the planet in 2013.

In many images, the planet appears as a blueish orb, sometimes with disappearing and reappearing dark spots. NASA’s James Webb Space Telescope has now revealed a different appearance—for the first time, a bright auroral glow from this ice giant.

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Full Article

For the first time, NASA’s James Webb Space Telescope has captured bright auroral activity on Neptune. Auroras occur when energetic particles, often originating from the Sun, become trapped in a planet’s magnetic field and eventually strike the upper atmosphere. The energy released during these collisions creates the signature glow.  In the past, astronomers have seen tantalizing hints of auroral activity on Neptune, for example, in the flyby of NASA’s Voyager 2 in 1989. However, imaging and confirming the auroras on Neptune has long evaded astronomers despite successful ...

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News releases highlighting the discoveries of NASA’s James Webb Space Telescope are produced for NASA by the Space Telescope Science Institute (STScI) in Baltimore, Maryland, under NASA Contract NAS5-03127. News release content is developed by the News Team in STScI’s Office of Public Outreach.

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