astronomy

NGC 4567 and NGC 4568

NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 rather than just read about it. In short: NGC 4567 and NGC 4568 (nicknamed the Butterfly Galaxies or Siamese Twins) are a set of unbarred spiral galaxies about 60 million light-years away in the constellation Virgo. They were both discovered by William Herschel in 1784.

Key takeaways

NGC 4567 and NGC 4568 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 4567 and NGC 4568 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4567 and NGC 4568 from memory before moving on to harder problems.

Reference excerpt

NGC 4567 and NGC 4568 (nicknamed the Butterfly Galaxies or Siamese Twins) are a set of unbarred spiral galaxies about 60 million light-years away in the constellation Virgo. They were both discovered by William Herschel in 1784. They are part of the Virgo Cluster of galaxies. These galaxies are in the process of colliding and merging with each other, as studies of their distributions of neutral and molecular hydrogen show, with the highest star-formation activity in the part where they overlap. However, the system is still in an early phase of interaction. In about 500 million years the galaxies will coalesce into a single elliptical galaxy.

Supernovae

Four supernovae have been observed in the Butterfly Galaxies:

SN 1990B (Type Ib, mag. 16) was discovered by Saul Perlmutter and Carlton Pennypacker on 20 January 1990. SN 2004cc (Type Ic, mag. 17.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 10 June 2004. SN 2020fqv (Type IIb, mag. 19) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 31 March 2020. SN 2023ijd (Type II, mag. 16.8) was discovered by ASAS-SN on 14 May 2023.

Naming controversy The two galaxies were nicknamed "Siamese Twins" because they appear to be connected. On August 5, 2020, NASA announced that they would not use that nickname in an effort to avoid systemic discrimination in their terminology.

See also Antennae Galaxies Eyes Galaxies

Notes

References

External links

Kopernik Space Images, Spiral Galaxies NGC 4568 and NGC 4567 aka "The Siamese Twins" : Supernova 2004cc, George Normandin (29 June 2004) Skyhound, The Siamese Twins SIMBAD, VCC 1673 : NGC 4567 -- Galaxy in Pair of Galaxies SIMBAD, VCC 1676 : NGC 4568 -- Galaxy in Pair of Galaxies NED, VV 219 NED, NGC 4567 NED, NGC 4568

Illustrations

Worked examples

Example 1 — a first encounter with NGC 4567 and NGC 4568

Start with the simplest possible case. Write down what NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568

In research: NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 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: NGC 4567 and NGC 4568 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Interacting galaxies, NGC objects, Overlapping galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4567 and NGC 4568 in simple terms?

Why does NGC 4567 and NGC 4568 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 NGC 4567 and NGC 4568?

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 NGC 4567 and NGC 4568.