science

Mare Marginis

Mare Marginis 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 Mare Marginis rather than just read about it. In short: Mare Marginis (Latin for 'Sea of the Edge'); MAR-jin-iss) is a lunar mare that lies on the very edge of the lunar nearside. The selenographic coordinates of this feature are 13.3° N, 86.1° E, and the diameter is 358 km.

Key takeaways

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

Reference excerpt

Mare Marginis (Latin for 'Sea of the Edge'); MAR-jin-iss) is a lunar mare that lies on the very edge of the lunar nearside. The selenographic coordinates of this feature are 13.3° N, 86.1° E, and the diameter is 358 km. This mare differs from most of the nearside maria; it has an irregular outline and appears fairly thin. It has small circular and elongated features in the mare plains that probably mark impact craters buried by less than 1000 to 1700 feet (300 to 500 m) of lava. Further, Mare Marginis is not centered on any clear, large impact basin. Thus, Mare Marginis marks a low-lying highlands region where mare lavas could reach the surface. Several large mare-floored craters also occur nearby. In these craters, the crater floors lie below the surrounding highland surface. Thus, they mark sites around Mare Marginis where lavas were close to the lunar surface. The major crater north of Marginis is Al-Biruni, with Ibn Yunus to the southeast and Goddard to the northwest. The surface of this mare displays some lunar swirls; higher albedo deposits are similar to the Reiner Gamma feature on the Oceanus Procellarum. This feature is associated with a relatively strong magnetic field. It is also located at the antipode of the Mare Orientale impact basin, and may be associated with forming that feature. Other possible explanations for the formation include a cometary impact, venting of volcanic gases, or just normal surface markings shielded from space weathering due to the magnetic field. However, the exact cause of albedo features such as this is not completely understood.

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Illustrations

Worked examples

Example 1 — a first encounter with Mare Marginis

Start with the simplest possible case. Write down what Mare Marginis 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 Mare Marginis 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 Mare Marginis 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 Mare Marginis

In research: Mare Marginis 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 Mare Marginis 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: Mare Marginis is common in secondary-school and first-year university syllabi. It links to neighbouring topics LQ13 quadrangle, Maria on the Moon, so understanding it makes those chapters shorter.
In everyday life: Look for Mare Marginis 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 Mare Marginis in 20 minutes

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

Frequently asked questions

What is Mare Marginis in simple terms?

Why does Mare Marginis 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 Mare Marginis?

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 Mare Marginis.