astronomy

Kevin J. Zahnle

Kevin J. Zahnle 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 Kevin J. Zahnle rather than just read about it. In short: Kevin J. Zahnle (born 1955) is a planetary scientist at the NASA Ames Research Center and a Fellow of the American Geophysical Union.

Key takeaways

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

Reference excerpt

Kevin J. Zahnle (born 1955) is a planetary scientist at the NASA Ames Research Center and a Fellow of the American Geophysical Union. He studies impact processes, atmospheric escape processes, geochemical modelling of atmophiles, and photochemical modelling. He also contributed to understanding the size-frequency distributions of minor planets and comets. He earned his PhD in 1985 at the University of Michigan under Prof. James C. G. Walker. He then completed postdoctoral fellowships at both Stanford and NRC at NASA Ames before coming to NASA Ames Research Center in 1988. Asteroid 7860 Zahnle, discovered by Edward Bowell at Anderson Mesa Station in 1980, was named in his honor. The official naming citation was published by the Minor Planet Center on 28 July 1999 (M.P.C. 35487).

References

External links https://www.nasa.gov/people/kevin-zahnle/ http://faculty.washington.edu/dcatling/Catling2009_SciAm.pdf https://web.archive.org/web/20140810044717/http://astrobiology.nasa.gov/directory/people/zahnle-kevin/

Worked examples

Example 1 — a first encounter with Kevin J. Zahnle

Start with the simplest possible case. Write down what Kevin J. Zahnle 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 Kevin J. Zahnle 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 Kevin J. Zahnle 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 Kevin J. Zahnle

In research: Kevin J. Zahnle 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 Kevin J. Zahnle 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: Kevin J. Zahnle is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1955 births, American scientist stubs, American scientists, so understanding it makes those chapters shorter.
In everyday life: Look for Kevin J. Zahnle 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 Kevin J. Zahnle in 20 minutes

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

Frequently asked questions

What is Kevin J. Zahnle in simple terms?

Kevin J. Zahnle (born 1955) is a planetary scientist at the NASA Ames Research Center and a Fellow of the American Geophysical Union.

Why does Kevin J. Zahnle 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 Kevin J. Zahnle?

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 Kevin J. Zahnle.