astronomy

NGC 750

NGC 750 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 750 rather than just read about it. In short: NGC 750 is an elliptical galaxy approximately 225 million light-years away from Earth in the constellation of Triangulum. It forms a close pair of interacting galaxies together with the nearby NGC 751 galaxy.

Key takeaways

NGC 750 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 750 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 750 from memory before moving on to harder problems.

Reference excerpt

NGC 750 is an elliptical galaxy approximately 225 million light-years away from Earth in the constellation of Triangulum. It forms a close pair of interacting galaxies together with the nearby NGC 751 galaxy. The pair is listed as Arp 166 in the Atlas of Peculiar Galaxies (in the category Galaxies with diffuse filaments).

Observational history German-born British astronomer William Herschel was first to discover a galaxy at this location on September 12, 1784, but he did not resolve this close pair, therefore he described it as a single object NGC 750. NGC 751, the second galaxy from this pair, which is smaller and fainter than NGC 750, was first resolved by Irish engineer and astronomer Bindon Stoney on October 11, 1850, who used Lord Rosse's 72" telescope.

Interaction with NGC 751 At least 100,000,000 years have passed since the moment of the first strong tidal perturbation between these two galaxies. Both galaxies are characterized by strong tidal interactions and distortions, and they are still in the process of efficient tidal interaction. The distance between the centers of this pair is 21", or 10 kpc in projection. Both galaxies have almost identical central radial velocities. While NGC 750 exhibits nearly flat radial velocity curves, the radial velocity curves of NGC 751 are characterized by large variations of more than 100 km s−1 along the slit. A large, diffuse tidal tail extends 20 arcsec (10 kpc) to the north-east of the pair.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 750

Start with the simplest possible case. Write down what NGC 750 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 750 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 750 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 750

In research: NGC 750 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 750 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 750 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1784, Discoveries by William Herschel, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 750 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “NGC 750” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study NGC 750 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 750 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 750 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 750 in simple terms?

Why does NGC 750 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 750?

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 750.