astronomy

GOODS-N-774

GOODS-N-774 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 GOODS-N-774 rather than just read about it. In short: GOODS-N-774 also called "Sparky", is a distant early galaxy which is in the process of core formation. The galaxy is massive and extremely compact, forming stars furiously.

Key takeaways

GOODS-N-774 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GOODS-N-774 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GOODS-N-774 from memory before moving on to harder problems.

Reference excerpt

GOODS-N-774 also called "Sparky", is a distant early galaxy which is in the process of core formation. The galaxy is massive and extremely compact, forming stars furiously. It is thought to be on its way to becoming a giant elliptical galaxy. This galaxy was discovered in 2014, and is some 11 billion light years distant. In the sky, it is located in the constellation of Ursa Major. It is the first discovered galaxy in this stage of giant galaxy formation.

Characteristics Sparky is forming stars at a rate of 300 stars per year, compared to our Milky Way's rate of 10. It is only 6,000 light-years (1,800 parsecs) across, unlike our galaxy's 100 kilolight-years (31 kpc) width. And GOODS-N-774, at 1.0×1011MSun, is around twice as massive as the Milky Way Galaxy. The amount of star formation and related high concentrations of gas and dust obscure the view of the galaxy, making it hard to detect. The ferocious rate of star formation is thought to be the result of the dark matter halo drawing great amounts of intergalactic gas into the core, fuelling the continuous starburst, of 1 billion years. The galaxy does not contain an active galactic nucleus, confounding some expectations.

See also List of galaxies List of nearest galaxies List of spiral galaxies

References

Further reading Erica Nelson, Pieter van Dokkum, Marijn Franx, Gabriel Brammer, Ivelina Momcheva, Natascha Förster Schreiber, Elisabete da Cunha, Linda Tacconi, Rachel Bezanson, Allison Kirkpatrick, Joel Leja, Hans-Walter Rix, Rosalind Skelton, Arjen van der Wel, Katherine Whitaker, Stijn Wuyts (4 May 2014). "A Massive Galaxy in its Core Formation Phase Three Billion Years After the Big Bang" (PDF). Nature. 513 (7518) (published 27 August 2014): 394–397. arXiv:1406.3350. Bibcode:2014Natur.513..394N. doi:10.1038/nature13616. hdl:1854/LU-8568234. PMID 25162527. S2CID 4459214.{{cite journal}}: CS1 maint: multiple names: authors list (link)

External links ESA/Hubble, "Distant galaxy core in the Hubble GOODS North field", NASA, ESA, and E. Nelson (Yale University, USA) 27 August 2014; (accessed 14-09-14) Hubblesite, "NASA Telescopes Help Uncover Early Construction Phase of Giant Galaxy", 27 August 2014, (STScI-2014-37), NASA phys.org, "Witnessing the early growth of a giant", 27 August 2014 (with video) Nature, "Structural properties of GOODS-N-774", (with PowerPoint) (accessed 09-14-14)

Worked examples

Example 1 — a first encounter with GOODS-N-774

Start with the simplest possible case. Write down what GOODS-N-774 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 GOODS-N-774 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 GOODS-N-774 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 GOODS-N-774

In research: GOODS-N-774 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 GOODS-N-774 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: GOODS-N-774 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Protogalaxies, Ursa Major, so understanding it makes those chapters shorter.
In everyday life: Look for GOODS-N-774 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 GOODS-N-774 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GOODS-N-774 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 GOODS-N-774 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GOODS-N-774 in simple terms?

GOODS-N-774 also called "Sparky", is a distant early galaxy which is in the process of core formation. The galaxy is massive and extremely compact, forming stars furiously.

Why does GOODS-N-774 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 GOODS-N-774?

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 GOODS-N-774.