science

Petavius (crater)

Petavius (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 Petavius (crater) rather than just read about it. In short: Petavius is a large lunar impact crater located to the southeast of the Mare Fecunditatis, near the southeastern lunar limb. Attached to the northwest rim is the smaller crater Wrottesley.

Key takeaways

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

Reference excerpt

Petavius is a large lunar impact crater located to the southeast of the Mare Fecunditatis, near the southeastern lunar limb. Attached to the northwest rim is the smaller crater Wrottesley. To the southeast are Palitzsch, Vallis Palitzsch, and Hase. Farther to the north is the large crater Vendelinus. Petavius appears oblong when viewed from the Earth due to foreshortening. Petavius is Imbrian in age.

Observations Rev. T. W. Webb described Petavius as,

"one of the finest spots in the Moon: its grand double rampart, on east side nearly 11,000 ft (3,400 m). High, its terraces, and convex interior with central hill and cleft, compose a magnificent landscape in the lunar morning or evening, entirely vanishing beneath a Sun risen but halfway to the meridian." The most favorable time for viewing this feature through a telescope is when the Moon is only three days old. By the fourth day the crater is nearly devoid of shadow. On the lunar geologic timescale, Petavius is one of the largest craters of Lower (Early) Imbrian age. The outer wall of Petavius is unusually wide in proportion to the diameter, and displays a double rim along the south and west sides. The height of the rim varies by as much as 50% from the lowest point, and a number of ridges radiate outwards from the rim. The convex crater floor has been resurfaced by lava flow, and displays a rille system named the Rimae Petavius. The large central mountains are a prominent formation with multiple peaks, climbing 1.7 kilometers above the floor. Anorthosite with a very low mafic abundance has been detected in this rise, and the infrared spectrum of pure crystalline plagioclase has been identified. A deep fracture runs from the peaks toward the southwest rim of the crater. 70-cm radar images of this crater and its surroundings show that the region of the surface beyond the wide outer rampart of Petavius has a dark halo, characteristic of a smooth surface free of boulders. It is thought that this may have been created by radial outbursts during the original impact that swept the area clean. Petavius B to the north-northwest of Petavius has a small ray system that lies across the surface of Mare Fecunditatis. Due to these rays, Petavius B is mapped as part of the Copernican System.

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 Petavius.

Views

References

Sources

External links Lunar Orbiter 5 acquired high-resolution images of Petavius: Frame 033, Frame 034, Frame 035, and Frame 036 Wood, Chuck (May 26, 2005). "A New Kind of DHC". Lunar Photo of the Day. Archived from the original on December 28, 2005. Retrieved 2005-05-26. Wood, Chuck (December 12, 2006). "Trenchent Observations of a Trench". Lunar Photo of the Day. Archived from the original on September 29, 2007. Retrieved 2006-12-12. Wood, Chuck (February 21, 2007). "The Hase–Petavius Rille". Lunar Photo of the Day. Archived from the original on September 29, 2007. Retrieved 2007-02-21. Wood, Chuck (November 20, 2007). "Limb Gift". Lunar Photo of the Day. Archived from the original on November 21, 2007. Retrieved 2007-11-20.

Illustrations

Worked examples

Example 1 — a first encounter with Petavius (crater)

Start with the simplest possible case. Write down what Petavius (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 Petavius (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 Petavius (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 Petavius (crater)

In research: Petavius (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 Petavius (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: Petavius (crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ21 quadrangle, so understanding it makes those chapters shorter.
In everyday life: Look for Petavius (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 Petavius (crater) in 20 minutes

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

Frequently asked questions

What is Petavius (crater) in simple terms?

Petavius is a large lunar impact crater located to the southeast of the Mare Fecunditatis, near the southeastern lunar limb. Attached to the northwest rim is the smaller crater Wrottesley.

Why does Petavius (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 Petavius (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 Petavius (crater).