astronomy

NGC 2906

NGC 2906 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 2906 rather than just read about it. In short: NGC 2906 is a spiral galaxy in the constellation Leo. It is circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 2906 is about 75,000 light years across.

Key takeaways

NGC 2906 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 2906 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2906 from memory before moving on to harder problems.

Reference excerpt

NGC 2906 is a spiral galaxy in the constellation Leo. It is circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 2906 is about 75,000 light years across. It was discovered by William Herschel on December 28, 1785. The galaxy is characterised by a normal star formation rate, which has been calculated to be 0.8 M☉ per year. The total mass of the galaxy is estimated to be 4×1010 M☉. A total of 241 HII regions have been identified in the galaxy. One supernova has been observed in NGC 2906, SN 2005ip. The supernova was discovered by T. Boles on November 6, 2005, with a 0.35m refractor, with an estimated apparent magnitude 15.5 and was identified as a type II supernova, probably within a few weeks past explosion. As the supernova declined in brightness, it reached a plateau that lasted for a bit more than two years and its spectrum became dominated by narrow lines (IIn), an unusual feature of supernovae, that was attributed to the interaction of the supernova with dust located around it. It is also possible that the supernova created dust. NGC 2906 is member of a group of galaxies, the NGC 2894 group. Other galaxies identified as members of the cluster are NGC 2882, NGC 2894, and IC 450.

References

External links Media related to NGC 2906 at Wikimedia Commons NGC 2906 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with NGC 2906

Start with the simplest possible case. Write down what NGC 2906 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 2906 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 2906 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 2906

In research: NGC 2906 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 2906 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 2906 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1785, Discoveries by William Herschel, Intermediate spiral galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2906 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 2906 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2906 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 2906 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2906 in simple terms?

NGC 2906 is a spiral galaxy in the constellation Leo. It is circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 2906 is about 75,000 light years across.

Why does NGC 2906 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 2906?

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 2906.