astronomy

NGC 3953

NGC 3953 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 3953 rather than just read about it. In short: NGC 3953 is a barred spiral galaxy located in the constellation Ursa Major. Its velocity with respect to the cosmic microwave background is 1,236±13 km/s, which corresponds to a Hubble distance of 59.4 ± 4.2 Mly (18.22 ± 1.29 Mpc).

Key takeaways

NGC 3953 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 3953 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 3953 from memory before moving on to harder problems.

Reference excerpt

NGC 3953 is a barred spiral galaxy located in the constellation Ursa Major. Its velocity with respect to the cosmic microwave background is 1,236±13 km/s, which corresponds to a Hubble distance of 59.4 ± 4.2 Mly (18.22 ± 1.29 Mpc). However, 33 non-redshift measurements give a closer mean distance of 54.10 ± 1.93 Mly (16.588 ± 0.592 Mpc). It was discovered by Pierre Méchain on 12 March 1781. NGC 3953 is known to exhibit an inner ring structure that encircles the bar. NGC 3953 is a member of the M109 Group, a large group of galaxies located within the constellation Ursa Major that may contain over 50 galaxies.

Supernovae

Two supernovae have been identified within NGC 3953:

SN 2001dp (Type Ia, mag. 14.5) was discovered by Marco Migliardi and E. Dal Farra on 12 August 2001. SN 2006bp (Type II, mag. 16.7) was discovered by Kōichi Itagaki on 9 April 2006.

References

External links

Spiral Galaxy NGC 3953 – Supernova 2001 dp SEDS: Spiral Galaxy NGC 3953

Illustrations

Worked examples

Example 1 — a first encounter with NGC 3953

Start with the simplest possible case. Write down what NGC 3953 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 3953 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 3953 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 3953

In research: NGC 3953 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 3953 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 3953 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1781, Barred spiral galaxies, Barred spiral galaxy stubs, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 3953 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 3953 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 3953 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 3953 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 3953 in simple terms?

Why does NGC 3953 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 3953?

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 3953.