astronomy

Sloan Great Wall

Sloan Great Wall is a astronomy 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 Sloan Great Wall rather than just read about it. In short: The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament). Its discovery was announced from Princeton University on October 20, 2003, by J.

Key takeaways

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

Reference excerpt

The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament). Its discovery was announced from Princeton University on October 20, 2003, by J. Richard Gott III, Mario Jurić, and their colleagues, based on data from the Sloan Digital Sky Survey.

Size The wall measures 1.37 billion light-years (1.30×1025 m) in length, located approximately one billion light-years away. In the sky, it is located within the region of the constellations Corvus, Hydra and Centaurus. It is approximately 1/60 of the diameter of the observable universe, making it the sixth largest known object after the large quasar groups Clowes-Campusano LQG, U1.11, Huge-LQG, the Giant GRB Ring and the galaxy filament Hercules–Corona Borealis Great Wall (Her-CrB GW), respectively. The Sloan Great Wall is between 1.8–2.7 times longer than the CfA2 Great Wall of galaxies (discovered by Margaret Geller and John Huchra of Harvard University in 1989). It also contains several galactic superclusters, the largest and richest of which is named SCl 126. This is located in the highest density region of the structure. In 2011, it was suggested that the SGW is a chance alignment of three structures, and not a structure in itself.

Illustrations

Worked examples

Example 1 — a first encounter with Sloan Great Wall

Start with the simplest possible case. Write down what Sloan Great Wall claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Sloan Great Wall 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 Sloan Great Wall 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 Sloan Great Wall

In research: Sloan Great Wall appears in astronomy 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 Sloan Great Wall 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: Sloan Great Wall is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2003, Discoveries by SDSS, Galaxy filaments, so understanding it makes those chapters shorter.
In everyday life: Look for Sloan Great Wall 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 Sloan Great Wall in 20 minutes

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

Frequently asked questions

What is Sloan Great Wall in simple terms?

The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament). Its discovery was announced from Princeton University on October 20, 2003, by J.

Why does Sloan Great Wall matter?

Because it connects several astronomy 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 Sloan Great Wall?

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 Sloan Great Wall.