astronomy

NGC 6164

NGC 6164 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 6164 rather than just read about it. In short: NGC 6164 and 6165 compose a bipolar emission nebula located 3,870 light years away in the constellation Norma. Known as the Dragon's Egg nebula due to its proximity to the Fighting Dragons of Ara, it was discovered by astronomer John Herschel on 1 July 1834.

Key takeaways

NGC 6164 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 6164 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6164 from memory before moving on to harder problems.

Reference excerpt

NGC 6164 and 6165 compose a bipolar emission nebula located 3,870 light years away in the constellation Norma. Known as the Dragon's Egg nebula due to its proximity to the Fighting Dragons of Ara, it was discovered by astronomer John Herschel on 1 July 1834.

Physical characteristics The nebula has two distinct lobes, with NGC 6164 constituting the one to the north of the central star, and NGC 6165, the one to the south. It is surrounded by a faint halo. Its shape gives it the appearance of a planetary nebula resulting from the death of an old star similar to the Sun, but it is in reality an emission nebula. The gas from this nebula was ejected by the star located at its center, and this is also the source of its ionisation. In the Henry Draper Catalogue, this star is designated as HD 148937. It is a very young O-type star whose age is between three and four million years. Surrounded by its magnetic field, this star is about 40 times more massive than the Sun, and is expected to go supernova in three to four million years.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6164

Start with the simplest possible case. Write down what NGC 6164 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 6164 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 6164 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 6164

In research: NGC 6164 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 6164 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 6164 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Discoveries by John Herschel, Emission nebulae, NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6164 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 6164 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6164 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 6164 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6164 in simple terms?

Why does NGC 6164 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 6164?

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 6164.