science

Halley (lunar crater)

Halley (lunar crater) is a science 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 Halley (lunar crater) rather than just read about it. In short: Halley is a lunar impact crater that is intruding into the southern wall of a walled plain named Hipparchus. Its diameter is 35 km.

Key takeaways

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

Reference excerpt

Halley is a lunar impact crater that is intruding into the southern wall of a walled plain named Hipparchus. Its diameter is 35 km. To the southwest of Halley is the large crater Albategnius, and due east lies the slightly smaller Hind. The rim of Halley is somewhat worn, the east being scoured by debris from the Imbrium basin, hence forming part of the Imbrium Sculpture. The interior floor of Halley is relatively flat, being filled with material of the same albedo of the surrounding terrain, and is probably melt from the Imbrium impact. This formation is named after the English astronomer Edmond Halley (1656-1742). On the 1645 map by Michael van Langren, the crater is called Gansii, for the gansa (a kind of wild swan) of Francis Godwin's The Man in the Moone. Its modern designation was formally adopted by the International Astronomical Union in 1935.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Halley.

References

Sources

External links

Halley at The Moon Wiki LTO-77C2 Halley — L&PI topographic map

Related article Wood, Chuck (May 27, 2007). "Drawings". Lunar Photo of the Day. Archived from the original on June 14, 2011.

Illustrations

Halley (lunar crater): Halley and its satellite features as seen from Earth — Halley and its satellite features as seen from Earth

Worked examples

Example 1 — a first encounter with Halley (lunar crater)

Start with the simplest possible case. Write down what Halley (lunar crater) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Halley (lunar crater) 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 Halley (lunar crater) 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 Halley (lunar crater)

In research: Halley (lunar crater) appears in science 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 Halley (lunar crater) 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: Halley (lunar crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ20 quadrangle, so understanding it makes those chapters shorter.
In everyday life: Look for Halley (lunar crater) 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 Halley (lunar crater) in 20 minutes

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

Frequently asked questions

What is Halley (lunar crater) in simple terms?

Halley is a lunar impact crater that is intruding into the southern wall of a walled plain named Hipparchus. Its diameter is 35 km.

Why does Halley (lunar crater) matter?

Because it connects several science 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 Halley (lunar crater)?

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 Halley (lunar crater).