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Rupes Recta

Rupes Recta 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 Rupes Recta rather than just read about it. In short: Rupes Recta is a linear fault on the Moon, in the southeastern part of the Mare Nubium. The name is Latin for straight cliff, although it is more commonly called the Straight Wall.

Rupes Recta — main illustration
Rupes Recta — illustration

Key takeaways

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

Reference excerpt

Rupes Recta is a linear fault on the Moon, in the southeastern part of the Mare Nubium. The name is Latin for straight cliff, although it is more commonly called the Straight Wall. This is the best-known escarpment on the Moon, and is a popular target for amateur astronomers.

When the sun illuminates the feature at an oblique angle at about day 8 of the Moon's orbit, the Rupes Recta casts a wide shadow that gives it the appearance of a steep cliff. The fault has a length of 110 km, a typical width of 2–3 km, and a height of 240–300 m. Thus although it appears to be a vertical cliff in the lunar surface, in actuality the grade of the slope is relatively shallow. To the west of this escarpment is the crater Birt, which is about 17 km in diameter. Also to the west is the Rima Birt rille. At the southern end is a group of hills often called the "Stag's-Horn Mountains", although this name is not officially recognized by the IAU. To the northeast is the crater Alpetragius, and to the east is Thebit.

References

External links Media related to Rupes Recta at Wikimedia Commons "Rupes Recta", Lunar Reconnaissance Orbiter, NASA, February 9, 2011, archived from the original on 2020-12-01, retrieved 2012-03-27 – mosaic image of Rupes Recta from the LROC WAC. Wood, Chuck (January 11, 2004). "Straight Wall". Lunar Photo of the Day. Wood, Chuck (February 22, 2004). "More Discoveries Near the Straight Wall". Lunar Photo of the Day. Wood, Chuck (July 30, 2004). "Obliquely Viewed Fault". Lunar Photo of the Day. Wood, Chuck (April 13, 2005). "Righteous Recti". Lunar Photo of the Day. Wood, Chuck (November 13, 2006). "Nokia Moon". Lunar Photo of the Day. Archived from the original on June 14, 2011. Wood, Chuck (February 13, 2007). "New Observations of a Well-Known Area". Lunar Photo of the Day. Archived from the original on June 14, 2011. Wood, Chuck (February 17, 2008). "Cornucopia of Details". Lunar Photo of the Day. Wood, Chuck (March 7, 2009). "The Beetle". Lunar Photo of the Day. Wood, Chuck (August 20, 2009). "Succession". Lunar Photo of the Day.

Illustrations

Rupes Recta: Rupes Recta (center) taken by Lunar Reconnaissance Orbiter.
Rupes Recta (center) taken by Lunar Reconnaissance Orbiter.
Rupes Recta: Oblique view of Rupes Recta (left), Birt (center), and Rima Birt (right), from Apollo 16
Oblique view of Rupes Recta (left), Birt (center), and Rima Birt (right), from Apollo 16
Rupes Recta: Taken with Olympus digital camera using 4.5" telescope. Since this is a telescopic view, this image is inverted.
Taken with Olympus digital camera using 4.5" telescope. Since this is a telescopic view, this image is inverted.

Worked examples

Example 1 — a first encounter with Rupes Recta

Start with the simplest possible case. Write down what Rupes Recta 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 Rupes Recta 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 Rupes Recta 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 Rupes Recta

In research
Rupes Recta 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 Rupes Recta 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
Rupes Recta is common in secondary-school and first-year university syllabi. It links to neighbouring topics Escarpments on the Moon, LQ19 quadrangle, so understanding it makes those chapters shorter.
In everyday life
Look for Rupes Recta 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 Rupes Recta in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Rupes Recta means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Rupes Recta out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Rupes Recta in simple terms?

Rupes Recta is a linear fault on the Moon, in the southeastern part of the Mare Nubium. The name is Latin for straight cliff, although it is more commonly called the Straight Wall.

Why does Rupes Recta 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 Rupes Recta?

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 Rupes Recta.

Tags

  • Escarpments on the Moon
  • LQ19 quadrangle

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