astronomy

Hans Elsässer

Hans Elsässer 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 Hans Elsässer rather than just read about it. In short: Hans Friedrich Elsässer (March 29, 1929 in Aalen – June 10, 2003 in Heidelberg) was a German astronomer and founding director of the Max Planck Institute for Astronomy in Heidelberg. Education and career Elsässer studied astronomy, physics and mathematics at the University of Tübingen from 1948 to 1953, where he received his doctorate in 1953 under Heinrich Siedentopf and his habilitation in 1959.

Key takeaways

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

Reference excerpt

Hans Friedrich Elsässer (March 29, 1929 in Aalen – June 10, 2003 in Heidelberg) was a German astronomer and founding director of the Max Planck Institute for Astronomy in Heidelberg.

Education and career Elsässer studied astronomy, physics and mathematics at the University of Tübingen from 1948 to 1953, where he received his doctorate in 1953 under Heinrich Siedentopf and his habilitation in 1959. From 1953 to 1955 he worked at the High Altitude Research Stations on the Swiss Jungfraujoch and at the Boyden Observatory in Bloemfontein, South Africa. From 1955 to 1956, Elsässer was part of European Southern Observatory's visual expeditions in South Africa. He then worked as a research assistant, first in Tübingen, then at the university observatory in Göttingen. In 1962 he became a full professor of astronomy at the University of Heidelberg. He was also head of the Heidelberg-Königstuhl State Observatory until 1975. Elsässer carried out various rocket and balloon experiments that were necessary for the successful implementation of the Helios A and B and Infrared Space Observatory (ISO) projects. He also researched in the areas of interstellar matter, star formation, active galaxies and large-scale structures in the cosmos. In 1962, Elsässer founded the German language popular science magazine Sterne und Weltraum (Stars and Space) together with Karl Schaifers and Rudolf Kühn. Elsässer remained co-editor until his death. In the 1960s, telescopes were in short supply in Germany. Elsässer worked intensively to eliminate this deficiency. In 1968, Elsässer was founding director of the Max Planck Institute for Astronomy (MPIA) in Heidelberg, having been in contact with the Max Planck Society since 1964. Elsässer remained managing director of the MPIA until 1994. He retired in 1997.

Honors and awards In 1983, Elsässer was elected a member of the German National Academy of Sciences Leopoldina. Since 1972 he has been a full member of the Heidelberg Academy of Sciences. In recognition of his achievements, the asteroid (4385) Elsässer was named after him.

References

Worked examples

Example 1 — a first encounter with Hans Elsässer

Start with the simplest possible case. Write down what Hans Elsässer 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 Hans Elsässer 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 Hans Elsässer 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 Hans Elsässer

In research: Hans Elsässer 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 Hans Elsässer 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: Hans Elsässer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1929 births, 2003 deaths, 20th-century astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Hans Elsässer 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 Hans Elsässer in 20 minutes

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

Frequently asked questions

What is Hans Elsässer in simple terms?

Hans Friedrich Elsässer (March 29, 1929 in Aalen – June 10, 2003 in Heidelberg) was a German astronomer and founding director of the Max Planck Institute for Astronomy in Heidelberg. Education and career Elsässer studied astronomy, physics and mathematics at the University of Tübingen from 1948 to…

Why does Hans Elsässer 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 Hans Elsässer?

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 Hans Elsässer.