astronomy

Sh 2-106

Sh 2-106 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 Sh 2-106 rather than just read about it. In short: Sh 2-106, also known as the Celestial Snow Angel, is an emission nebula and a star formation region in the constellation Cygnus. It is a H II region estimated to be around 2,000 light years (600 pc) from Earth, in an isolated area of the Milky Way.

Key takeaways

Sh 2-106 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sh 2-106 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sh 2-106 from memory before moving on to harder problems.

Reference excerpt

Sh 2-106, also known as the Celestial Snow Angel, is an emission nebula and a star formation region in the constellation Cygnus. It is a H II region estimated to be around 2,000 light years (600 pc) from Earth, in an isolated area of the Milky Way. In the center of the nebula is a young and massive star that emits jets of hot gas from its poles, forming the bipolar structure. Dust that surrounds the star is also ionized by it. The nebula spans about 2 light-years across.

Central star The central star, a source of infrared radiation usually referred to as S106 IR or S106 IRS 4. It is a massive star, approximately 15 solar masses. Two jets of matter streaming from its poles heat surrounding matter to a temperature of around 10,000 °C. Dust that is not ionized by the star's jets reflect light from the star. With an estimated surface temperature of 37,000 K, it is classified as a type O8 star. It loses around 10−6 M ⊙ {\displaystyle {\begin{smallmatrix}M_{\odot }\end{smallmatrix}}} per year in solar winds, ejecting material at around 100 km/s. Studies of images has revealed that the star-forming region has also created hundreds of low-mass brown dwarf stars and protostars.

References

External links NASA Astronomy Picture of the Day: Star Forming Region S106 (16 February 2016)

Illustrations

Worked examples

Example 1 — a first encounter with Sh 2-106

Start with the simplest possible case. Write down what Sh 2-106 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 Sh 2-106 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 Sh 2-106 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 Sh 2-106

In research: Sh 2-106 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 Sh 2-106 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: Sh 2-106 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cygnus (constellation), Emission nebulae, H II regions, so understanding it makes those chapters shorter.
In everyday life: Look for Sh 2-106 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Sh 2-106 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sh 2-106 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 Sh 2-106 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sh 2-106 in simple terms?

Why does Sh 2-106 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 Sh 2-106?

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 Sh 2-106.