astronomy

GRW +70 8247

GRW +70 8247 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 GRW +70 8247 rather than just read about it. In short: GRW +70 8247 is a white dwarf star located 42 light-years from Earth in the constellation Draco. With a magnitude of about 13 it is visible only through a large telescope.

Key takeaways

GRW +70 8247 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GRW +70 8247 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GRW +70 8247 from memory before moving on to harder problems.

Reference excerpt

GRW +70 8247 is a white dwarf star located 42 light-years from Earth in the constellation Draco. With a magnitude of about 13 it is visible only through a large telescope.

Properties Although photographed in the 19th century as part of the Carte du Ciel project, the star was not determined to be a white dwarf until G. P. Kuiper observed it in 1934. This makes it the fifth or sixth white dwarf discovered. At first, its spectrum was thought to be almost featureless, but later observation showed it to have unusual broad, shallow absorption bands. In 1970, when light that it emitted was observed to be circularly polarized, it became the first white dwarf known to have a magnetic field. In the 1980s, it was realized that the unusual absorption bands could be explained as hydrogen absorption lines shifted by the Zeeman effect.

Notes

References

Worked examples

Example 1 — a first encounter with GRW +70 8247

Start with the simplest possible case. Write down what GRW +70 8247 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 GRW +70 8247 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 GRW +70 8247 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 GRW +70 8247

In research: GRW +70 8247 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 GRW +70 8247 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: GRW +70 8247 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Draco (constellation), Gliese and GJ objects, White dwarf star stubs, so understanding it makes those chapters shorter.
In everyday life: Look for GRW +70 8247 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 GRW +70 8247 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GRW +70 8247 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 GRW +70 8247 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GRW +70 8247 in simple terms?

GRW +70 8247 is a white dwarf star located 42 light-years from Earth in the constellation Draco. With a magnitude of about 13 it is visible only through a large telescope.

Why does GRW +70 8247 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 GRW +70 8247?

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 GRW +70 8247.