astronomy

GW231123

GW231123 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 GW231123 rather than just read about it. In short: GW231123 was a gravitational wave detected by the two LIGO detectors on 23 November 2023. As of 2025, it is the largest binary black hole merger yet detected, at 225+26−43 solar masses (M☉) for the final object.

Key takeaways

GW231123 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GW231123 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GW231123 from memory before moving on to harder problems.

Reference excerpt

GW231123 was a gravitational wave detected by the two LIGO detectors on 23 November 2023. As of 2025, it is the largest binary black hole merger yet detected, at 225+26−43 solar masses (M☉) for the final object. One or both of the objects involved in the merger may have been in the upper black hole mass gap.

Characteristics GW231123 was the result of the merger of a 137+22−17 M☉ black hole and a 103+20−52 M☉ black hole creating a new intermediate-mass black hole. It occurred at an estimated distance of 2.2+1.9−1.5 Gpc. The parent black holes have unusually large spins, with a magnitude of 0.9+0.10−0.19 and 0.8+0.20−0.51 for the two.

Science results The high mass of both components of the binary black hole raises questions on its formation, as some very massive stars are thought to undergo pair-instability supernova, which do not leave a remnant; this is thought to result in a gap in the black hole mass distribution between 60 and 130 M☉ (although there is some uncertainty on the limits). This suggests that the system has undergone a more complex process, e.g. with the black holes possibly resulting from earlier mergers, which is known as a "hierarchical" merger (this hypothesis is in particular supported by the high spins of the black holes). As the signal is extremely short, it is also possible that the signal originates from another type of system, such as cosmic strings, although it is considered unlikely.

References

Worked examples

Example 1 — a first encounter with GW231123

Start with the simplest possible case. Write down what GW231123 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 GW231123 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 GW231123 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 GW231123

In research: GW231123 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 GW231123 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: GW231123 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2023 in outer space, Astronomical objects discovered in 2023, Gravitational-wave events, so understanding it makes those chapters shorter.
In everyday life: Look for GW231123 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 GW231123 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GW231123 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 GW231123 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GW231123 in simple terms?

Why does GW231123 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 GW231123?

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 GW231123.