astronomy

NGC 3628

NGC 3628 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 NGC 3628 rather than just read about it. In short: NGC 3628, also known as the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by William Herschel in 1784.

Key takeaways

NGC 3628 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 3628 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 3628 from memory before moving on to harder problems.

Reference excerpt

NGC 3628, also known as the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by William Herschel in 1784. It has an approximately 300,000 light-years long tidal tail. Along with M65 and M66, NGC 3628 forms the Leo Triplet, a small group of galaxies. Its most conspicuous feature is the broad and obscuring band of dust located along the outer edge of its spiral arms, effectively transecting the galaxy to the view from Earth. Due to the presence of an x-shaped bulge, visible in multiple wavelengths, it has been argued that NGC 3628 is instead a barred spiral galaxy with the bar seen end-on. Simulations have shown that bars often form in disk galaxies during interactions and mergers, and NGC 3628 is known to be interacting with its two large neighbors. When viewed through a telescope, its often seen as a dim orb, as it has a relatively low surface brightness for a supposedly famous galaxy. Though, when viewed with a larger one, it begins to show off more of its intricate detail such as its prominent dust lane, obscuring its core. The name "Hamburger Galaxy" is a reference to its shape resembling a hamburger, while the name "Sarah's Galaxy" is thought to refer to poet Sarah Williams (1837–1868), most famous for the poem "The Old Astronomer:"

Gallery

References

External links Media related to NGC 3628 at Wikimedia Commons SEDS: Spiral Galaxy NGC 3628 NASA Astronomy Picture of the Day: The Tidal Tail of NGC 3628 (27 July 2007) Szymanek, Nik; Gray, Meghan. "M65 – Spiral Galaxy". Deep Sky Videos. Brady Haran.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 3628

Start with the simplest possible case. Write down what NGC 3628 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 NGC 3628 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 NGC 3628 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 NGC 3628

In research: NGC 3628 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 NGC 3628 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: NGC 3628 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1784, Leo (constellation), Leo Triplet, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 3628 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 NGC 3628 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 3628 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 NGC 3628 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 3628 in simple terms?

NGC 3628, also known as the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by William Herschel in 1784.

Why does NGC 3628 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 NGC 3628?

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 NGC 3628.