science

Progress 39

Progress 39 is a science 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 Progress 39 rather than just read about it. In short: Progress 39 (Russian: Прогресс 39) was a Soviet unmanned Progress cargo spacecraft, which was launched in December 1988 to resupply the Mir EO-4 expedition aboard the Mir space station. Launch Progress 39 launched on 25 December 1988 from the Baikonur Cosmodrome in the Kazakh SSR.

Key takeaways

Progress 39 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Progress 39 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Progress 39 from memory before moving on to harder problems.

Reference excerpt

Progress 39 (Russian: Прогресс 39) was a Soviet unmanned Progress cargo spacecraft, which was launched in December 1988 to resupply the Mir EO-4 expedition aboard the Mir space station.

Launch Progress 39 launched on 25 December 1988 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U2 rocket.

Docking Progress 39 docked with the aft port of the Kvant-1 module of Mir on 27 December 1988 at 05:35:10 UTC, and was undocked on 7 February 1989 at 06:45:34 UTC.

Decay It remained in orbit until 7 February 1989, when it was deorbited. The deorbit burn occurred at around 12:49 UTC and the mission ended at 13:49 UTC.

Illustrations

Worked examples

Example 1 — a first encounter with Progress 39

Start with the simplest possible case. Write down what Progress 39 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Progress 39 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 Progress 39 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 Progress 39

In research: Progress 39 appears in science 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 Progress 39 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: Progress 39 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1988 in the Soviet Union, Cargo spaceflights to Mir, Progress (spacecraft) missions, so understanding it makes those chapters shorter.
In everyday life: Look for Progress 39 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 Progress 39 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Progress 39 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 Progress 39 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Progress 39 in simple terms?

Progress 39 (Russian: Прогресс 39) was a Soviet unmanned Progress cargo spacecraft, which was launched in December 1988 to resupply the Mir EO-4 expedition aboard the Mir space station. Launch Progress 39 launched on 25 December 1988 from the Baikonur Cosmodrome in the Kazakh SSR.

Why does Progress 39 matter?

Because it connects several science 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 Progress 39?

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 Progress 39.