astronomy

Leo Cloud

Leo Cloud 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 Leo Cloud rather than just read about it. In short: The Leo II Groups, Leo II Cloud, or simply the Leo Cloud is a galaxy filament consisting of at least 18 galaxy groups. It is located approximately 86 Mly (26 Mpc) from the Solar System.

Key takeaways

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

Reference excerpt

The Leo II Groups, Leo II Cloud, or simply the Leo Cloud is a galaxy filament consisting of at least 18 galaxy groups. It is located approximately 86 Mly (26 Mpc) from the Solar System. The Leo Cloud in supergalactic SGY coordinates is physically behind the Virgo Cluster. Eventually, over the next Hubble time, the galaxy groups that make up the Leo II Cloud will infall and merge with the Virgo Cluster. The Leo Cloud, along with the Crater Cloud which contains the NGC 4038 Group, is actually part of the same branch of a larger galaxy filament that extends from the Centaurus Cluster through the Virgo Cluster and continues through the Ursa Major Cluster, known as the Virgo Strand. The Virgo Strand is the main component of the Virgo Supercluster and is made of two branches with the lower branch consisting of the Leo and Crater clouds, while the upper branch is known as the Virgo Southern Extension or Virgo II Groups. The Leo Cloud itself is actually composed of two filaments, the Leo II A and Leo II B filaments. The Leo II A filament consists of the majority of the cloud, while the Leo II B filament consists of a sparse region of the cloud. The Leo Cloud, like the Virgo III Cloud, is prolate and points toward the Virgo Cluster.

List of groups Below is a list of groups in the Leo Cloud according to astronomer Brent Tully.

Column 1: The name of the group in Tully's NBGG Column 2: The right ascension for epoch 2000. Column 3: The declination for epoch 2000. Column 4: Number of members of the group. Column 5: Brightest member of the group Column 6: Redshift of the group. Column 7: Distance of the group (Millions of light-years). Column 8: Cross-Identifications with other catalogs. (Sources for data columns:)

See also M96 Group Virgo II Groups Virgo III Groups

References

Illustrations

Worked examples

Example 1 — a first encounter with Leo Cloud

Start with the simplest possible case. Write down what Leo Cloud 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 Leo Cloud 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 Leo Cloud 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 Leo Cloud

In research: Leo Cloud 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 Leo Cloud 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: Leo Cloud is common in secondary-school and first-year university syllabi. It links to neighbouring topics Galaxy filaments, Leo Cloud, Virgo Supercluster, so understanding it makes those chapters shorter.
In everyday life: Look for Leo Cloud 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 Leo Cloud in 20 minutes

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

Frequently asked questions

What is Leo Cloud in simple terms?

The Leo II Groups, Leo II Cloud, or simply the Leo Cloud is a galaxy filament consisting of at least 18 galaxy groups. It is located approximately 86 Mly (26 Mpc) from the Solar System.

Why does Leo Cloud 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 Leo Cloud?

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 Leo Cloud.