science

Kosmos 394

Kosmos 394 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 Kosmos 394 rather than just read about it. In short: Kosmos 394 (Russian: Космос 394 meaning Cosmos 394), also known as DS-P1-M No.2 is a satellite which was used to demonstrate technology for future satellites which would be used as targets for tests of anti-satellite weapons. It was launched by the Soviet Union in 1971 as part of the Dnepropetrovsk Sputnik programme.

Key takeaways

Kosmos 394 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kosmos 394 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kosmos 394 from memory before moving on to harder problems.

Reference excerpt

Kosmos 394 (Russian: Космос 394 meaning Cosmos 394), also known as DS-P1-M No.2 is a satellite which was used to demonstrate technology for future satellites which would be used as targets for tests of anti-satellite weapons. It was launched by the Soviet Union in 1971 as part of the Dnepropetrovsk Sputnik programme. Following the completion of testing it was intercepted and destroyed by Kosmos 397 on 25 February.

Launch It was launched aboard a Kosmos-3M carrier rocket, from Site 132/1 at the Plesetsk Cosmodrome. The launch occurred at 18:48:48 UTC on 9 February 1971.

Orbit Kosmos 394 was placed into a low Earth orbit with a perigee of 522 kilometres (324 mi), an apogee of 552 kilometres (343 mi), 65.8 degrees of inclination, and an orbital period of 95.4 minutes. As of 2009, debris from its destruction is still in orbit. Kosmos 394 was the second of the five original DS-P1-M satellites to be launched, and the first to successfully reach orbit. The three subsequent launches were all successful, before the satellite was replaced with a derivative, Lira. DS-P1-M and Lira satellites were used as targets for the Istrebitel Sputnikov programme.

Worked examples

Example 1 — a first encounter with Kosmos 394

Start with the simplest possible case. Write down what Kosmos 394 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 Kosmos 394 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 Kosmos 394 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 Kosmos 394

In research: Kosmos 394 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 Kosmos 394 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: Kosmos 394 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1971 in spaceflight, 1971 in the Soviet Union, Dnepropetrovsk Sputnik program, so understanding it makes those chapters shorter.
In everyday life: Look for Kosmos 394 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 Kosmos 394 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kosmos 394 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 Kosmos 394 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kosmos 394 in simple terms?

Why does Kosmos 394 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 Kosmos 394?

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 Kosmos 394.