science

Kosmos 909

Kosmos 909 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 909 rather than just read about it. In short: Kosmos 909 (Russian: Космос 909 meaning Cosmos 909) was a satellite which was used as a target for tests of anti-satellite weapons. It was launched by the Soviet Union in 1977 as part of the Dnepropetrovsk Sputnik programme, and used as a target for Kosmos 910 and Kosmos 918, as part of the Istrebitel Sputnikov programme.

Key takeaways

Kosmos 909 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 909 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kosmos 909 from memory before moving on to harder problems.

Reference excerpt

Kosmos 909 (Russian: Космос 909 meaning Cosmos 909) was a satellite which was used as a target for tests of anti-satellite weapons. It was launched by the Soviet Union in 1977 as part of the Dnepropetrovsk Sputnik programme, and used as a target for Kosmos 910 and Kosmos 918, as part of the Istrebitel Sputnikov programme. It was launched aboard a Kosmos-3M carrier rocket, from Site 132/2 at the Plesetsk Cosmodrome. The launch occurred at 16:30 UTC on 19 May 1977. Kosmos 909 was placed into a low Earth orbit with a perigee of 985 kilometres (612 mi), an apogee of 2,111 kilometres (1,312 mi), 65.9 degrees of inclination, and an orbital period of 117 minutes. Attempted interceptions by Kosmos 910 and 918 on 23 May and 17 June respectively failed, and as of 2009 Kosmos 909 remains in orbit. Kosmos 909 was the fifth of ten Lira satellites to be launched, of which all but the first were successful. Lira was derived from the earlier DS-P1-M satellite, which it replaced.

Worked examples

Example 1 — a first encounter with Kosmos 909

Start with the simplest possible case. Write down what Kosmos 909 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 909 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 909 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 909

In research: Kosmos 909 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 909 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 909 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1977 in spaceflight, Dnepropetrovsk Sputnik program, Istrebitel Sputnikov program, so understanding it makes those chapters shorter.
In everyday life: Look for Kosmos 909 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 909 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kosmos 909 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 909 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kosmos 909 in simple terms?

Why does Kosmos 909 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 909?

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 909.