astronomy

NGC 7236

NGC 7236 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 7236 rather than just read about it. In short: NGC 7236 is an interacting lenticular galaxy located in the constellation Pegasus. It is located at a distance of about 300 million light years from Earth, which, given its apparent dimensions, means that NGC 7236 is about 150,000 light years across.

Key takeaways

NGC 7236 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 7236 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 7236 from memory before moving on to harder problems.

Reference excerpt

NGC 7236 is an interacting lenticular galaxy located in the constellation Pegasus. It is located at a distance of about 300 million light years from Earth, which, given its apparent dimensions, means that NGC 7236 is about 150,000 light years across. NGC 7236 forms a pair with NGC 7237 and is a radio galaxy. It was discovered by Albert Marth on August 25, 1864. NGC 7236 forms a pair with elliptical galaxy NGC 7237, which lies 35 arcseconds to the southeast. The two galaxies are undergoing a merger and are surrounded by hot gas (corona) with temperature of around 1 keV. The total mass of that gas is estimated to be 3×1010 M☉. A smaller elliptical galaxy, NGC 7237C, lies 38 arcseconds southeast of NGC 7237. A faint tail emanates from NGC 7236. It is included in the Atlas of Peculiar Galaxies, in the category diffuse counter-tails. A tail is also visible in X-rays. A dust lane runs across the galaxy. The galaxy pair is a source of radiowaves. The radio emission has a double lobe structure, with filaments, but no jets, while a weak core is identified as the nucleus of NGC 7237. The filaments could be created by the interaction of hot gas with the preexisting radio emitting plasma. Some bright radio sources are visible within the lobes but they could be background active galaxies. One supernova has been observed in NGC 7236: SN 2019krv (type Ia, mag. 18.4).

See also List of NGC objects (7001–7840)

Gallery

References

External links

NGC 7236 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images NGC 7236 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 7236

Start with the simplest possible case. Write down what NGC 7236 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 7236 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 7236 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 7236

In research: NGC 7236 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 7236 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 7236 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3C objects, Arp objects, Astronomical objects discovered in 1864, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 7236 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 7236 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 7236 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 7236 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 7236 in simple terms?

Why does NGC 7236 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 7236?

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 7236.