science

Progress M-21M

Progress M-21M 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 M-21M rather than just read about it. In short: Progress M-21M (Russian: Прогресс М-21М), identified by NASA as Progress 53P, was a Progress spacecraft used by Roskosmos to resupply the International Space Station (ISS) during 2013. Progress M-21M was built by RKK Energia.

Key takeaways

Progress M-21M 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 M-21M to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Progress M-21M from memory before moving on to harder problems.

Reference excerpt

Progress M-21M (Russian: Прогресс М-21М), identified by NASA as Progress 53P, was a Progress spacecraft used by Roskosmos to resupply the International Space Station (ISS) during 2013. Progress M-21M was built by RKK Energia.

Launch The spacecraft was launched on time at 20:53:06 UTC on 25 November 2013 from the Baikonur Cosmodrome in Kazakhstan.

Docking The Kurs-NA docking system was tested by Progress M-21M during a fly-by of the ISS on 28 November 2013. Progress M-21M later docked with the ISS on 29 November 2013 at 22:30:20 UTC.

Cargo Progress M-21M delivers goods to the ISS, as fuel components, water, service equipment, equipment for scientific experiments, containers with food, and parcels for the crew. The total mass of all delivered goods is 2398 pounds.

Orbit change On 13 March 2014, Progress M-21M was used to raise the orbit of the ISS by "two kilometers" after an engine burn of "almost ten minutes".

Kurs-NA docking system re-test Due to problems with the Kurs-NA docking system during the last test in November 2013, another test with the system was successfully done during a two-day free flying period in April 2014. Progress M-21M undocked from the Zvezda module at 08:58 UTC on 23 April 2014 and was guided back to the same docking port two days later, docking at 12:13 UTC on 25 April 2014.

Undocking and reentry Progress M-21M undocked from the ISS on 9 June 2014 at 13:29 UTC and was deorbited the same day at 17:23 UTC.

References

Illustrations

Worked examples

Example 1 — a first encounter with Progress M-21M

Start with the simplest possible case. Write down what Progress M-21M 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 M-21M 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 M-21M 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 M-21M

In research: Progress M-21M 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 M-21M 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 M-21M is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2013 in Russia, Progress (spacecraft) missions, Russian spacecraft stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Progress M-21M 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 M-21M in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Progress M-21M 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 M-21M out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Progress M-21M in simple terms?

Why does Progress M-21M 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 M-21M?

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 M-21M.