earth science

Mare Tranquillitatis pit

Mare Tranquillitatis pit is a earth 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 Tranquillitatis pit rather than just read about it. In short: The Mare Tranquillitatis pit is the name given to an elliptical opening on the Moon's surface in the Mare Tranquillitatis, situated roughly 400 kilometers (250 miles) away from the landing site of Apollo 11. The pit was created by a lunar lava tube, and is currently the deepest known lunar pit with a radius of at least 100 meters (328 feet).

Key takeaways

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

Reference excerpt

The Mare Tranquillitatis pit is the name given to an elliptical opening on the Moon's surface in the Mare Tranquillitatis, situated roughly 400 kilometers (250 miles) away from the landing site of Apollo 11. The pit was created by a lunar lava tube, and is currently the deepest known lunar pit with a radius of at least 100 meters (328 feet). The lunar feature is notable for being the first lunar cave proven to exist beyond theoretical frameworks, and of being direct evidence of the existence of natural lunar shelter that could potentially be used as a lunar base.

Description The pit is located at 8.3355°N, 33.222°E on the moon's surface. Radar imaging indicated that the pit's funnel is roughly 20 meters deep, while the inner pit has a depth of approximately 105 meters. The diameter of the pit's funnel was between 140 and 146 meters long while the diameter of the inner pit is 88–100 meters long. The pit's walls were visible down to a depth of about 80 meters. Radar showed that a hollow space encompasses the entire circumference of the pit at a depth of roughly 40 meters below the lunar surface. The pit floor beneath its eastern side slopes downward at an angle between 10° and 20° to a depth of at least 135 meters. The rest of the floor directly below the pit opening is flat and covered with boulders, including two boulders of 8–10 meters in size situated at the south-western section of the pit floor. The pit contains overhanging walls on the pit's northern, eastern, and western sides that extend no less than 10 to 15 meters outwards. Imaging did not indicate the presence of any significant features on the surface near the pit.

Cave system Current radar studies analyzed that the Mare Tranquillitatis pit is an ellipse-shaped skylight. The studies noted that the pit floor appeared to extend underground beyond the opening by at least tens of meters, potentially indicting the presence of a cave conduit. Research of the cave based on radar data estimates that the size of the underground portion is no less than 130 feet (40 meters) wide extending to the western side. The pit was formed from a collapsed lava tube. Research has yet to determine if the pit's features are connected to other lunar pits.

Research The pit was first detected in 2009 by SELENE orbiter cameras. Radar studies conducted by an astronomical research team led by University of Trento professors Leonardo Carrer and Lorenzo Bruzzone and published on 15 June 2024 used radar imaging from the NASA Lunar Reconnaissance Orbiter to determine the shape and structures of the pit and features connected to it.

Potential moonbase site The researchers noted that the additional underground space connected to the pit could make it a potential host of a future lunar base due to the cave's protection from prologued exposure to the surface's environment, including from solar radiation, cosmic ray exposure, and micrometeorite impacts. They also posited that it would be easier to set up and maintain a lunar base relative to constructing one on the surface, even while accounting for the need to maintain the walls of the conduit to prevent their collapse. The pit's lunar base could enable astronauts to conduct extended lunar missions. A thermophysical model of the cave was constructed by a 2022 research team and compared with thermal emission data from the Diviner Lunar Radiometer. It was concluded that the pit remained about 100 K warmer than the surrounding surface at night and about 20 K cooler at day. The warmest pits were equatorial pits with regolith-covered floors, whose floors could reach over 420 K, but even in those, permanently shadowed areas of the cave remained about 290 K.

See also List of lunar features Lunar lava tube

References

Bibliography Horvath, Tyler; Hayne, Paul O.; Paige, David A. (2022-07-08). "Thermal and Illumination Environments of Lunar Pits and Caves: Models and Observations From the Diviner Lunar Radiometer Experiment". Geophysical Research Letters. 49 (14). doi:10.1029/2022GL099710. eISSN 1944-8007.

External links Research paper — Nature Pit imaging — Pits Atlas: Mare Tranquillitatis Pit

Illustrations

Worked examples

Example 1 — a first encounter with Mare Tranquillitatis pit

Start with the simplest possible case. Write down what Mare Tranquillitatis pit claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth 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 Tranquillitatis pit 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 Tranquillitatis pit 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 Tranquillitatis pit

In research: Mare Tranquillitatis pit appears in earth 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 Tranquillitatis pit 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 Tranquillitatis pit is common in secondary-school and first-year university syllabi. It links to neighbouring topics Colonization of the Moon, Exploration of the Moon, Human spaceflight, so understanding it makes those chapters shorter.
In everyday life: Look for Mare Tranquillitatis pit 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 Tranquillitatis pit in 20 minutes

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

Frequently asked questions

What is Mare Tranquillitatis pit in simple terms?

Why does Mare Tranquillitatis pit matter?

Because it connects several earth 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 Tranquillitatis pit?

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 Tranquillitatis pit.