astronomy

Sh 2-78

Sh 2-78 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 Sh 2-78 rather than just read about it. In short: Sh 2-78 is a planetary nebula in Aquila. It was discovered by Stewart Sharpless while assembling his catalogue, and identified as a planetary nebula in 1990.

Key takeaways

Sh 2-78 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sh 2-78 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sh 2-78 from memory before moving on to harder problems.

Reference excerpt

Sh 2-78 is a planetary nebula in Aquila. It was discovered by Stewart Sharpless while assembling his catalogue, and identified as a planetary nebula in 1990. It has a central star with a magnitude of 17. The central star is a variable star, with a variability of 0.3 in magnitude.

References

Worked examples

Example 1 — a first encounter with Sh 2-78

Start with the simplest possible case. Write down what Sh 2-78 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 Sh 2-78 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 Sh 2-78 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 Sh 2-78

In research: Sh 2-78 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 Sh 2-78 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: Sh 2-78 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquila (constellation), Planetary nebulae, Sharpless objects, so understanding it makes those chapters shorter.
In everyday life: Look for Sh 2-78 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 “Sh 2-78” →

Affiliate

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

How to study Sh 2-78 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sh 2-78 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 Sh 2-78 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sh 2-78 in simple terms?

Sh 2-78 is a planetary nebula in Aquila. It was discovered by Stewart Sharpless while assembling his catalogue, and identified as a planetary nebula in 1990.

Why does Sh 2-78 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 Sh 2-78?

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 Sh 2-78.