astronomy

UGC 2885

UGC 2885 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 2885 rather than just read about it. In short: UGC 2885, Rubin's Galaxy, or the Godzilla galaxy is a giant barred spiral galaxy of type SA(rs)c in the constellation Perseus. It is 84 megaparsecs (274.0 million light-years) from Earth and measures 134.3 kiloparsecs (438,000 light-years) across, making it one of the largest known spiral galaxies.

Key takeaways

UGC 2885 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 2885 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UGC 2885 from memory before moving on to harder problems.

Reference excerpt

UGC 2885, Rubin's Galaxy, or the Godzilla galaxy is a giant barred spiral galaxy of type SA(rs)c in the constellation Perseus. It is 84 megaparsecs (274.0 million light-years) from Earth and measures 134.3 kiloparsecs (438,000 light-years) across, making it one of the largest known spiral galaxies. It is also a possible member of the Perseus–Pisces Supercluster. UGC 2885 is a spiral galaxy with a relatively low surface brightness, but does not have as low of a surface brightness as other so-called giant low surface brightness galaxies. UGC 2885 is classified as a field galaxy, being remarkably isolated from other galaxies. It is unknown how it got its cold gas which is necessary for star formation. NASA has reported that the theorized main source for disk growth for UGC 2885 came from the accretion of intergalactic hydrogen gas, rather than through the repeated process of galactic collision, as most galaxies are thought to grow. The lack of interaction is evident from the near-perfect structure of the spiral arms and disk, lack of tidal tails, and modest rate of star formation—approximately 0.5 solar masses/year. Additionally, despite being originally classified as an unbarred spiral galaxy, new Hubble images clearly show the presence of a small bar cutting across the ring structure of the core. This is peculiar, as most bars are thought to form through minor gravitational perturbations brought on by satellite and neighboring galaxies, which is something this galaxy lacks. This galaxy highlights that bars are able to form in spiral galaxies without the influence of another galaxy—this indicates that other forces, such as interactions between stars, gas and dust, as well as the gravitational influence of dark matter, might play a role in their development.

Supernovae Two supernovae have been observed in UGC 2885:

SN 2002F (Type II, mag. 18.1) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) using the Katzman Automatic Imaging Telescope on 17 January 2002. SN 2025aant (Type II, mag. 18.424) was discovered by ATLAS on 15 October 2025.

See also Condor Galaxy (NGC 6872) and IC 4970, largest known spiral galaxy and its neighbor Malin 1, giant low surface brightness spiral galaxy NGC 262, spiral galaxy with giant hydrogen cloud ESO 383-76, one of largest galaxies overall IC 1101, giant lenticular galaxy

External links WATCH: Rubin’s Galaxy: A Gentle Giant Spiral Galaxy by the Space Telescope Science Institute on June 3, 2020

Notes

References

Illustrations

Worked examples

Example 1 — a first encounter with UGC 2885

Start with the simplest possible case. Write down what UGC 2885 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 2885 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 2885 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 2885

In research: UGC 2885 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 2885 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 2885 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Godzilla (franchise), IRAS catalogue objects, Interacting galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for UGC 2885 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 2885 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UGC 2885 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 2885 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UGC 2885 in simple terms?

Why does UGC 2885 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 2885?

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 2885.