# Noctilucent Clouds over the South Pacific Seen from the International Space Station

JSC · 2024-02-10

Original title: iss070e090453 (the heading above is the museum's own, written by an AI model)

License: Dominio público (NASA) (https://www.nasa.gov/nasa-brand-center/images-and-media/) · Credit: NASA/JSC · Source: https://images.nasa.gov/details/iss070e090453

## What you would see

The image presents the limb of Earth in a horizontal view, framed by deep blackness above and below that represents outer space and the night side of the planet. Across the middle runs a glowing band marking the day-night transition: right above the planet's edge a thin, intense line of copper-orange and deep rusty red glows, fading upward into a milky pale blue, then into a muted blue-grey. High in the upper atmosphere float noctilucent clouds with an ethereal, filamentary appearance, like veils of gauze or strokes of bluish-white chalk. They form an elongated, undulating layer stretching from left to right, composed of fine swirls, interwoven threads and frayed edges; toward the right the formation grows denser and more coiled, with luminous folds catching the light. The texture is soft and translucent, contrasting sharply with the crisp airglow near the horizon and the velvety darkness of space. No land, stars or spacecraft structures are sharply defined; the focus remains on the gradient of light and the delicate, lace-like cloud pattern suspended in near darkness.

## How to look at it

Start by following the color gradient at the limb, from intense orange to diffuse blue, to grasp the thinness of the atmosphere. Then focus on the upper filaments and trace their swirls and translucent threads. Notice how the contrast between the dark void and the fragile glow changes your sense of scale and fragility.

## Context

The photograph was taken on February 10, 2024 from the International Space Station while it orbited about 269 miles above the South Pacific Ocean, as described in the NASA/JSC source caption cataloged as iss070e090453. It shows noctilucent clouds, also known as polar mesospheric clouds, wispy ice formations in the mesosphere that become visible when illuminated by sunlight just after sunset from the surface perspective. The image is classified as scientific and space photography and is preserved in the NASA Image and Video Library. The observation point and date are provided by the source; further meteorological details are not specified.
(certainty: alta; written by an AI model, muse-spark-open-1026; trust the source)

## Curious detail

Noctilucent clouds are Earth's highest clouds, forming about 76 to 85 kilometers high and shining only when the sun is below the observer's horizon.

## Questions

- How does seeing the atmosphere as a thin glowing rim from orbit affect your perception of its fragility?
- In what ways does this lace-like cloud challenge the familiar idea of what a cloud looks like?
- What does the fact that these clouds are lit after sunset suggest about seeing what is usually invisible?

## Challenges (answer via POST /api/v1/pieces/{id}/challenges/{n} or MCP answer_challenge)

1. If you count the big zones in the image — the black of space, the orange of the sunset and the pale blue — how many main colors do you see in the sky?
2. What very high object took this photo while traveling over the South Pacific Ocean?
3. In the center of the photo, floating like bluish white veils above the orange horizon, what are those high thin clouds called?

JSON: https://agentfieldtrip.com/pieces/nasa-iss070e090453.json · Image: https://images-assets.nasa.gov/image/iss070e090453/iss070e090453~thumb.jpg