astronomy

NGC 7020

NGC 7020 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 7020 rather than just read about it. In short: NGC 7020 is a barred lenticular galaxy in the constellation Pavo. Its velocity with respect to the cosmic microwave background is 3,102±27 km/s, which corresponds to a Hubble distance of 149.2 ± 10.6 Mly (45.75 ± 3.25 Mpc).

Key takeaways

NGC 7020 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 7020 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 7020 from memory before moving on to harder problems.

Reference excerpt

NGC 7020 is a barred lenticular galaxy in the constellation Pavo. Its velocity with respect to the cosmic microwave background is 3,102±27 km/s, which corresponds to a Hubble distance of 149.2 ± 10.6 Mly (45.75 ± 3.25 Mpc). However, two non-redshift measurements give a much closer mean distance of 95.89 ± 27.40 Mly (29.400 ± 8.400 Mpc). NGC 7020 was discovered by British astronomer John Herschel on June 22, 1835.

Physical characteristics NGC 7020 has a large outer ring surrounding a bright inner hexagonal zone containing an inner ring and possibly a bar. The large outer ring is completely detached from the inner hexagonal zone of the galaxy and is dominated by numerous flocculent spiral features. The outer ring has an estimated diameter of 143,700 ly (44.05 kpc). The ring is knotty and bluer than the rest of the galaxy and shows where recent star formation is occurring in NGC 7020. The possible inner ring shows protruding features at the ends of its major axis therefore classifying it as a bar. The galaxy appears to be fairly free of ionized gas, which is not surprising for an early-type galaxy.

Nearby galaxies NGC 7020 is member of a sparse group of galaxies that contains IC 5084, IC 5092, IC 5096, NGC 6943, NGC 7083, NGC 7096, NGC 7125, NGC 7126 and ESO 107-14. However, NGC 7020 is not interacting with any other galaxy in the group.

See also NGC 7098 NGC 7013 NGC 4429 galaxy in the Virgo Cluster with a similar structure List of NGC objects (7001–7840)

References

External links NGC 7020 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with NGC 7020

Start with the simplest possible case. Write down what NGC 7020 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 7020 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 7020 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 7020

In research: NGC 7020 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 7020 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 7020 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1835, Barred lenticular galaxies, Discoveries by John Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 7020 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 7020 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 7020 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 7020 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 7020 in simple terms?

Why does NGC 7020 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 7020?

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 7020.