astronomy

NGC 888

NGC 888 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 888 rather than just read about it. In short: NGC 888 is a large and relatively distant elliptical galaxy in the constellation Horologium. Its velocity relative to the cosmic microwave background is 8662±40 km/s, corresponding to a Hubble distance of 127.8±9.0 Mpc.

Key takeaways

NGC 888 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 888 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 888 from memory before moving on to harder problems.

Reference excerpt

NGC 888 is a large and relatively distant elliptical galaxy in the constellation Horologium. Its velocity relative to the cosmic microwave background is 8662±40 km/s, corresponding to a Hubble distance of 127.8±9.0 Mpc. It was discovered by British astronomer John Herschel in 1834.

Characteristics A redshift-independent distance measurement gives 136.0 Mpc, which is consistent within uncertainties with the Hubble distance. NGC 888 is classified as a flat-spectrum radio galaxy.

Galaxy pair NGC 888 and ESO 115-003 form a galaxy pair. The Hubble distance of ESO 115-003 is 134.65±9.45 Mpc. Considering the uncertainties in the distances, it is possible that the two galaxies form a physical pair.

Supernova One supernova has been observed in NGC 888:

SN 2016frs (Type Ia, mag. 16.1) was discovered by MASTER on 23 August 2016.

References

External links NGC 888 sur spider.seds.org NGC 888 sur la base de données LEDA NGC 888 sur WikiSky NGC 888 sur le site du professeur C. Seligman

Illustrations

Worked examples

Example 1 — a first encounter with NGC 888

Start with the simplest possible case. Write down what NGC 888 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 888 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 888 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 888

In research: NGC 888 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 888 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 888 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Discoveries by John Herschel, Elliptical galaxies, Galaxies discovered in 1834, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 888 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 888 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 888 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 888 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 888 in simple terms?

Why does NGC 888 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 888?

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 888.