astronomy

MOA-2007-BLG-400Lb

MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb rather than just read about it. In short: MOA-2007-BLG-400Lb is an extrasolar planet located approximately 20000 light-years away in the constellation of Sagittarius, orbiting the star MOA-2007-BLG-400L. This planet was detected on September 18, 2008 by the gravitational microlensing by Dong.

Key takeaways

MOA-2007-BLG-400Lb belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MOA-2007-BLG-400Lb to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MOA-2007-BLG-400Lb from memory before moving on to harder problems.

Reference excerpt

MOA-2007-BLG-400Lb is an extrasolar planet located approximately 20000 light-years away in the constellation of Sagittarius, orbiting the star MOA-2007-BLG-400L. This planet was detected on September 18, 2008 by the gravitational microlensing by Dong. It has mass between 50% and 130% of Jupiter and orbits between 0.6 and 1.1 AU.

References

Dong, Subo; et al. (2009). "Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet" (abstract). The Astrophysical Journal. 698 (2): 1826–1837. arXiv:0809.2997. Bibcode:2009ApJ...698.1826D. doi:10.1088/0004-637X/698/2/1826. S2CID 16658501.web preprint

External links "MOA-2007-BLG-400-L". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-10-11.

Worked examples

Example 1 — a first encounter with MOA-2007-BLG-400Lb

Start with the simplest possible case. Write down what MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb

In research: MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb 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: MOA-2007-BLG-400Lb is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanet stubs, Exoplanets detected by microlensing, Exoplanets discovered in 2008, so understanding it makes those chapters shorter.
In everyday life: Look for MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MOA-2007-BLG-400Lb in simple terms?

Why does MOA-2007-BLG-400Lb 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 MOA-2007-BLG-400Lb?

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 MOA-2007-BLG-400Lb.