astronomy

UGC 3855

UGC 3855 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 UGC 3855 rather than just read about it. In short: UGC 3855, also known as PGC 21067 or sometimes as the Modest galaxy, is a spiral galaxy in the constellation of Lynx. Its velocity with respect to the cosmic microwave background is 3,236±9 km/s, which corresponds to a Hubble distance of 155.7 ± 10.9 Mly (47.73 ± 3.35 Mpc).

Key takeaways

UGC 3855 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UGC 3855 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UGC 3855 from memory before moving on to harder problems.

Reference excerpt

UGC 3855, also known as PGC 21067 or sometimes as the Modest galaxy, is a spiral galaxy in the constellation of Lynx. Its velocity with respect to the cosmic microwave background is 3,236±9 km/s, which corresponds to a Hubble distance of 155.7 ± 10.9 Mly (47.73 ± 3.35 Mpc). However, 4 non-redshift measurements give a closer mean distance of 130.95 ± 11.37 Mly (40.150 ± 3.486 Mpc). The first known reference to this galaxy comes from Part 1 of the Morphological Catalogue of Galaxies, published in 1962, where it is listed as MCG +10-11-052. It is a relatively old galaxy with a stellar population around 10.6 billion years old. It also has a low rate of star formation of about 0.2 solar masses per year.

Supernova One supernova has been observed in UGC 3855: SN 2021agco (Type Ib, mag. 17.6) was discovered by the Xingming Observatory Sky Survey (XOSS) on 5 December 2021. It is the closest ultra-stripped supernova yet discovered.

References

External links Media related to UGC 3855 at Wikimedia Commons UGC 3855 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 UGC 3855

Start with the simplest possible case. Write down what UGC 3855 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 UGC 3855 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 UGC 3855 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 UGC 3855

In research: UGC 3855 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 UGC 3855 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: UGC 3855 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lynx (constellation), MCG objects, Principal Galaxies Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for UGC 3855 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 UGC 3855 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UGC 3855 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 UGC 3855 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UGC 3855 in simple terms?

Why does UGC 3855 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 UGC 3855?

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 UGC 3855.