astronomy

South America Galaxy

South America Galaxy 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 South America Galaxy rather than just read about it. In short: The South America Galaxy, also known as LEDA 69877 and IRAS 22491-1808, is a merging pair of ultraluminous infrared galaxies located in the constellation Aquarius. It is estimated to be 1.045 billion light-years from the Milky Way and about 90,000 light-years in diameter.

Key takeaways

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

Reference excerpt

The South America Galaxy, also known as LEDA 69877 and IRAS 22491-1808, is a merging pair of ultraluminous infrared galaxies located in the constellation Aquarius. It is estimated to be 1.045 billion light-years from the Milky Way and about 90,000 light-years in diameter. The object is moving away from the Solar System with a calculated radial velocity of approximately 23.300 kilometers per second. The galaxy got its nickname due to its physical resemblance to the continent of South America. The galaxy was selected as ESA/HUBBLE's picture of the week on 10 June 2013. In the complex central region of the galaxy, scientists have been able to distinguish two nuclei, remains of the two different galaxies that are currently colliding. IRAS 22491-1808 is among the most luminous of these types of galaxies, and is considered to be mid-way through its merging stage. According to a study published in 2017, the mass of the molecular gas outflow in IRAS 22491-1808 is estimated to be MH2(hot)~ 6−8 × 103 M☉. Notable, it also shows lack of polarization.

Illustrations

Worked examples

Example 1 — a first encounter with South America Galaxy

Start with the simplest possible case. Write down what South America Galaxy 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 South America Galaxy 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 South America Galaxy 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 South America Galaxy

In research: South America Galaxy 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 South America Galaxy 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: South America Galaxy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquarius (constellation), Galaxy mergers, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for South America Galaxy 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 South America Galaxy in 20 minutes

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

Frequently asked questions

What is South America Galaxy in simple terms?

Why does South America Galaxy 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 South America Galaxy?

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 South America Galaxy.