astronomy

MACS1149-JD1

MACS1149-JD1 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 MACS1149-JD1 rather than just read about it. In short: MACS1149-JD1 (also known as JD1 and PCB2012 3020) is a young galaxy that is known for being one of the farthest known galaxies from Earth. It was discovered in 2014 and confirmed in 2018.

Key takeaways

MACS1149-JD1 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MACS1149-JD1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MACS1149-JD1 from memory before moving on to harder problems.

Reference excerpt

MACS1149-JD1 (also known as JD1 and PCB2012 3020) is a young galaxy that is known for being one of the farthest known galaxies from Earth. It was discovered in 2014 and confirmed in 2018. The JD1 galaxy is at a redshift of about z=9.11, or about 13.28 billion ly (4.07 billion pc) away from Earth meaning that it formed when the universe was around 500 million years old. The carbon and neon abundances of JD1 are below the solar abundance ratio. The under-abundance of carbon suggests recent star formation where a Type II supernova enriched the interstellar medium (ISM) with oxygen, but intermediate mass stars have not yet enriched the ISM with carbon. Due to a lack of old population stars detected, JD1 is probably a young galaxy. We are able to see this galaxy because of the gravitational lensing caused by the MACS J1149.5+2223 Galaxy Cluster.

See also CEERS-93316 GLASS-z12 HD1 galaxy List of the most distant astronomical objects

References

External links Media related to MACS1149-JD1 at Wikimedia Commons NASA Telescopes Spy Ultra-Distant Galaxy

Illustrations

Worked examples

Example 1 — a first encounter with MACS1149-JD1

Start with the simplest possible case. Write down what MACS1149-JD1 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 MACS1149-JD1 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 MACS1149-JD1 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 MACS1149-JD1

In research: MACS1149-JD1 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 MACS1149-JD1 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: MACS1149-JD1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dwarf galaxies, Leo (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for MACS1149-JD1 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 MACS1149-JD1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MACS1149-JD1 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 MACS1149-JD1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MACS1149-JD1 in simple terms?

MACS1149-JD1 (also known as JD1 and PCB2012 3020) is a young galaxy that is known for being one of the farthest known galaxies from Earth. It was discovered in 2014 and confirmed in 2018.

Why does MACS1149-JD1 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 MACS1149-JD1?

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 MACS1149-JD1.