astronomy

Paul Kalas

Paul Kalas 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 Paul Kalas rather than just read about it. In short: Paul Kalas (born August 13, 1967) is a Greek American astronomer known for his discoveries of debris disks around stars. Kalas led a team of scientists to obtain the first visible-light images of an extrasolar planet with orbital motion around the star Fomalhaut, at a distance of 25 light years from Earth.

Key takeaways

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

Reference excerpt

Paul Kalas (born August 13, 1967) is a Greek American astronomer known for his discoveries of debris disks around stars. Kalas led a team of scientists to obtain the first visible-light images of an extrasolar planet with orbital motion around the star Fomalhaut, at a distance of 25 light years from Earth. The planet is referred to as Fomalhaut b.

Background Kalas was born in New York City to George Kavallinis and Maria Drettakis, who immigrated to the United States from Heraklion, Crete. Kalas attended Detroit Country Day School in Michigan, and studied astronomy and physics at the University of Michigan, Ann Arbor. He earned a Doctor of Philosophy in Astronomy in 1996 from the University of Hawaiʻi under the direction of astronomer David C. Jewitt. Kalas worked as a postdoctoral scientist at the Max Planck Institute for Astronomy in Heidelberg, Germany, the Space Telescope Science Institute, and the University of California, Berkeley. In 2006, he became an adjunct professor of astronomy at the University of California, Berkeley. Kalas lives with his wife Aspasia Gkika and daughters Maria-Nikoleta and Natalia near Berkeley, California.

Discoveries Kalas discovered several circumstellar disks using a coronagraph on the Hubble Space Telescope and at the University of Hawaii 2.2-meter telescope at Mauna Kea, Hawaii. In 1995 he discovered various forms of asymmetric structures in optical images of the Beta Pictoris disk. He was the lead scientist for the first optical images of debris disks surrounding the nearby red dwarf AU Microscopii and the bright star Fomalhaut. Kalas's Hubble Space Telescope image of Fomalhaut revealed a narrow belt of dusty material analogous to our Solar System's Kuiper Belt. However, Kalas also found that Fomalhaut's belt is narrow and geometrically offset from the star by 15 astronomical units. These features are considered strong evidence for an extrasolar planet orbiting Fomalhaut that gravitationally sculpts the morphology of the belt.

Honors Elected Fellow of the American Association for the Advancement of Science (2014) AIAA William H. Pickering Lecture (2010) Newcomb Cleveland Prize of the American Association for the Advancement of Science (2009)

Selected publications

Articles Kalas, P.; Liu, M.C. & Matthews, B.C. (2004). "Discovery of a large dust disk around the nearby star AU Microscopii". Science. 303 (5666): 1990–1992. arXiv:astro-ph/0403132. Bibcode:2004Sci...303.1990K. doi:10.1126/science.1093420. PMID 14988511. S2CID 6943137. Kalas, P.; Graham, J.R. & Clampin, M. (2005). "A planetary system as the origin of structure in Fomalhaut's dust belt". Nature. 435 (7045): 1067–1070. arXiv:astro-ph/0506574. Bibcode:2005Natur.435.1067K. doi:10.1038/nature03601. PMID 15973402. S2CID 4406070. Kalas, Paul; et al. (2008). "Optical Images of an Exosolar Planet 25 Light-Years from Earth". Science. 322 (5906): 1345–1348. arXiv:0811.1994. Bibcode:2008Sci...322.1345K. doi:10.1126/science.1166609. PMID 19008414. S2CID 10054103.

Books Kalas, Paul (2018), The Oneironauts: Using dreams to engineer our future', Amazon Digital Services LLC - Kdp, ISBN 978-1720177616

References

External links The Circumstellar Disk Learning Site Kalas's homepage Sky & Telescope Article on Fomalhaut discovery Space.com article on AU Microscopii discovery New Scientist article on HD 53143 and HD 139664 discoveries

Illustrations

Worked examples

Example 1 — a first encounter with Paul Kalas

Start with the simplest possible case. Write down what Paul Kalas 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 Paul Kalas 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 Paul Kalas 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 Paul Kalas

In research: Paul Kalas 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 Paul Kalas 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: Paul Kalas is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1967 births, 20th-century American people of Greek descent, 20th-century Greek astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Paul Kalas 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 Paul Kalas in 20 minutes

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

Frequently asked questions

What is Paul Kalas in simple terms?

Why does Paul Kalas 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 Paul Kalas?

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 Paul Kalas.