science

Mare Undarum

Mare Undarum 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 Undarum rather than just read about it. In short: Mare Undarum (Latin undārum, the "sea of waves") is a shallow, irregular lunar mare located just north of Mare Spumans on the lunar near side, between the crater Firmicus and the eastern limb. It lies within a trough between the third and fourth raised rings formed by the impact that created the Mare Crisium.

Key takeaways

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

Reference excerpt

Mare Undarum (Latin undārum, the "sea of waves") is a shallow, irregular lunar mare located just north of Mare Spumans on the lunar near side, between the crater Firmicus and the eastern limb. It lies within a trough between the third and fourth raised rings formed by the impact that created the Mare Crisium. The selenographic coordinates of this mare are 7.5° N, 68.7° E. It has a maximum diameter of 245 km. There are five known lunar domes within the mare. The surrounding basin material is of the Nectarian epoch, with the mare basalt being of the Upper Imbrian epoch. The crater Dubyago can be seen on the southern edge of the mare. On the northeastern edge of the mare is the crater Condorcet P. When Mädler observed this area in the 1830s, he noted variations in the curved dark streaks that form this mare, leading him to speculate that the changes were caused by vegetation.

Fictional references Mare Undarum was the location of the second catapult in Robert A. Heinlein's novel The Moon Is a Harsh Mistress (1966). The exact location of the catapult was kept secret and was "A matter of Lunar national security."

Gallery

Illustrations

Worked examples

Example 1 — a first encounter with Mare Undarum

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

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

Affiliate

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

How to study Mare Undarum in 20 minutes

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

Frequently asked questions

What is Mare Undarum in simple terms?

Why does Mare Undarum 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 Undarum?

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 Undarum.