astronomy

Zhúlóng (galaxy)

Zhúlóng (galaxy) is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Zhúlóng (galaxy) rather than just read about it. In short: Zhúlóng is an extremely massive grand-design spiral galaxy located at a redshift distance of z=5.2 (12.8 Gly) in the constellation of Sextans. It is believed to be the most distant known grand design spiral galaxy.

Key takeaways

Zhúlóng (galaxy) belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Zhúlóng (galaxy) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Zhúlóng (galaxy) from memory before moving on to harder problems.

Reference excerpt

Zhúlóng is an extremely massive grand-design spiral galaxy located at a redshift distance of z=5.2 (12.8 Gly) in the constellation of Sextans. It is believed to be the most distant known grand design spiral galaxy. Spiral galaxies beyond redshift 3.0 are generally rare with only a few known. The galaxy has well-defined spiral arms that have dense star formation regions while the core is quiescent. However the rate of star formation is low, forming 66 solar masses of stars per year. The size of this galaxy is comparable to the Milky Way galaxy, being an estimated 62,000 light years in diameter. It has a mass of around 100 billion solar masses.

Naming The galaxy was named Zhúlóng, meaning “Torch Dragon” in Chinese mythology. In the myth, Zhúlóng is a powerful red solar dragon that creates day and night by opening and closing its eyes, symbolizing light and cosmic time.

Discovery Zhúlóng was discovered by a team led by Mengyuan Xiao, and announced in a paper submitted to Astronomy & Astrophysics on 17 December 2024, and published on 16 April 2025. The discovery was surprising to astronomers, who had previously believed that spiral galaxies took billions of years to develop.

Image gallery

References

External links Zhúlóng (galaxy) on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with Zhúlóng (galaxy)

Start with the simplest possible case. Write down what Zhúlóng (galaxy) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Zhúlóng (galaxy) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Zhúlóng (galaxy) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Zhúlóng (galaxy)

In research: Zhúlóng (galaxy) appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Zhúlóng (galaxy) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Zhúlóng (galaxy) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2024, Galaxies discovered in 2024, Sextans, so understanding it makes those chapters shorter.
In everyday life: Look for Zhúlóng (galaxy) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Zhúlóng (galaxy) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Zhúlóng (galaxy) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Zhúlóng (galaxy) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Zhúlóng (galaxy) in simple terms?

Why does Zhúlóng (galaxy) matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Zhúlóng (galaxy)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Zhúlóng (galaxy).