astronomy

Hal A. Weaver

Hal A. Weaver 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 Hal A. Weaver rather than just read about it. In short: Harold Anthony "Hal" Weaver, Jr. (born 1953) is an American astronomer, known for his research into the composition of solar system bodies including comets and Kuiper belt objects.

Key takeaways

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

Reference excerpt

Harold Anthony "Hal" Weaver, Jr. (born 1953) is an American astronomer, known for his research into the composition of solar system bodies including comets and Kuiper belt objects. Weaver attended Duke University as an undergraduate, and obtained his PhD from Johns Hopkins, where he researched the spectra of comets using data from the International Ultraviolet Explorer space telescope. Since 2002 Weaver has worked at the Applied Physics Laboratory. He is co-investigator on the Alice ultraviolet imaging spectrometer on board the Rosetta mission to comet 67P/Churyumov–Gerasimenko, In the 1990s and 2000s he worked on the Far Ultraviolet Spectroscopic Explorer space telescope, conducted research into comets using the Hubble Space Telescope, and co-led the Pluto Companion Search Team that in 2005 discovered the second and third moons of Pluto (Nix and Hydra) using the Hubble Space Telescope. His involvement in the New Horizons mission to Pluto and beyond meant that Weaver was also co-discoverer of Kerberos and Styx in 2011 and 2012 respectively. Weaver has frequently appeared with New Horizons principal investigator Alan Stern at press briefings announcing the mission's findings following the fly-bys of Pluto and 486958 Arrokoth, and has made media appearances to discuss the mission. The Mars-crossing asteroid 5720 Halweaver is named after him.

References

"NASA Reveals Pluto Close-Up Images from New Horizons". C-SPAN.org. July 15, 2015. "Harold, Weaver". Science Research Portal. Archived from the original on August 21, 2019. Retrieved August 21, 2019. "Harold A Weaver's Publons profile". Publons.com. Retrieved August 21, 2019. "Library of Congress". Id.loc.gov. Retrieved August 21, 2019.

External links Recent bibliography

Illustrations

Worked examples

Example 1 — a first encounter with Hal A. Weaver

Start with the simplest possible case. Write down what Hal A. Weaver 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 Hal A. Weaver 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 Hal A. Weaver 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 Hal A. Weaver

In research: Hal A. Weaver 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 Hal A. Weaver 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: Hal A. Weaver is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1953 births, American planetary scientists, Duke University alumni, so understanding it makes those chapters shorter.
In everyday life: Look for Hal A. Weaver 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 Hal A. Weaver in 20 minutes

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

Frequently asked questions

What is Hal A. Weaver in simple terms?

Harold Anthony "Hal" Weaver, Jr. (born 1953) is an American astronomer, known for his research into the composition of solar system bodies including comets and Kuiper belt objects.

Why does Hal A. Weaver 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 Hal A. Weaver?

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 Hal A. Weaver.