astronomy

NGC 5256

NGC 5256 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 5256 rather than just read about it. In short: NGC 5256 is an object that contains two disc galaxies, that are colliding into each other. It is located in the constellation Ursa Major, and was discovered by William Herschel on 12 May 1787.

Key takeaways

NGC 5256 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 5256 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5256 from memory before moving on to harder problems.

Reference excerpt

NGC 5256 is an object that contains two disc galaxies, that are colliding into each other. It is located in the constellation Ursa Major, and was discovered by William Herschel on 12 May 1787. The two nuclei of the galaxies are separated by about 13,000 light-years. The southwest and northeast nuclei have masses of 7×109 M☉ and 10×109 M☉, assuming they orbit around a common center of mass. NGC 5256 is located at about 420 million light-years away from the Earth. NGC 5256 is also known as Markarian 266 and is one of the Markarian galaxies, included in the Markarian Survey due to its high amount of ultraviolet emission. However, it is also a luminous infrared galaxy (LIRG); most of its energy is emitted in the infrared range.

See also List of NGC objects (5001–6000) List of NGC objects

References

External links Media related to NGC 5256 at Wikimedia Commons "Cosmic Collisions Galore!". Hubble Site. Retrieved 2 October 2015.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 5256

Start with the simplest possible case. Write down what NGC 5256 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 5256 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 5256 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 5256

In research: NGC 5256 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 5256 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 5256 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Interacting galaxies, Luminous infrared galaxies, Markarian galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5256 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 5256 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5256 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 5256 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5256 in simple terms?

NGC 5256 is an object that contains two disc galaxies, that are colliding into each other. It is located in the constellation Ursa Major, and was discovered by William Herschel on 12 May 1787.

Why does NGC 5256 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 5256?

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 5256.