A Map of Sculptor Like Never Before

The building blocks of a galaxy—stars, gas, and dust—emit light in a wide range of colors. Each color carries unique clues, and the more colors astronomers capture, the deeper their understanding of a galaxy’s inner workings becomes. Traditional images reveal only a handful of colors, but the new map of the Sculptor Galaxy contains thousands. With this unprecedented detail, researchers can probe the age, chemical makeup, and motion of its stars, gas, and dust.

Figure 1. Twin Spacecraft Align to Reproduce a Solar Eclipse in Space

To construct the map of Sculptor, also known as NGC 253, astronomers observed the galaxy—located 11 million light-years away—for more than 50 hours using the MUSE instrument on ESO’s Very Large Telescope. The final result required stitching together over 100 exposures, covering an area about 65,000 light-years across. Figure 1 shows Twin Spacecraft Align to Reproduce a Solar Eclipse in Space.

A Tool for Zooming In and Out

As Heidelberg University’s Kathryn Kreckel explains, the dataset is uniquely versatile: “We can zoom in to study individual star-forming regions nearly at the scale of single stars, but we can also zoom out to see the galaxy as a whole.”

In their initial analysis, the team identified around 500 planetary nebulae—glowing shells of gas and dust expelled by dying stars similar to the Sun. Co-author Fabian Scheuermann, a doctoral student at Heidelberg University, highlights the significance: “Beyond our galactic neighborhood, we usually deal with fewer than 100 detections per galaxy.”

Planetary nebulae are more than cosmic landmarks—they serve as distance markers. “Finding them allows us to verify the distance to the galaxy, a critical piece of information on which the rest of the studies depend,” adds Adam Leroy of The Ohio State University.

Looking ahead, astronomers plan to use the Sculptor map to study how gas flows, evolves, and fuels star formation across the galaxy. As study co-author Congiu notes: “How such small processes can have such a big impact on a galaxy thousands of times larger is still a mystery.”

The Idea Behind Proba-3

Solar eclipses are rare and short-lived, but they reveal the Sun’s mysterious outer atmosphere, the corona. To study it more often and in greater detail, scientists designed Proba-3, a mission using two spacecraft that can mimic an eclipse in space on command.

How the Two Spacecraft Work Together

The first spacecraft, shaped like a circular disk, positions itself in front of the Sun to block its bright central light—just like the Moon during a natural eclipse. The second spacecraft, carrying a sensitive camera, sits about 150 meters (492 feet) behind it, in the perfect spot to capture clear images of the corona.

The Precision Challenge

Coordinating two satellites moving at up to 127,000 kph (79,000 mph) is no small feat. They must stay aligned within one millimeter of accuracy while keeping their separation stable for hours. Achieving this demonstrates advanced “formation flying” technology, which could be vital for future space missions.

Scientific Goals

By creating artificial eclipses, Proba-3 allows scientists to study the Sun’s corona, track high-energy particles, and better understand solar storms. These storms, while responsible for Earth’s auroras, can also damage satellites. Proba-3’s data will help improve predictions of such space weather events.

Beyond Solar Studies

The techniques tested in Proba-3 have far-reaching potential. Future missions could use similar precision flying to dock with and remove space junk, or to build giant space telescopes with mirrors and instruments spread across multiple spacecraft. Proba-3 is not just about eclipses—it’s a step toward the future of space exploration.

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025), Two Spacecraft Align to Create an Artificial Solar Eclipse in Space, AnaTechMaz, pp.509