International Space Station — Prelims Strategy

Prelims Strategy

For the International Space Station (ISS), a Prelims-focused strategy demands a strong emphasis on factual accuracy and current developments. Begin by mastering the core facts: the five primary partner agencies (NASA, Roscosmos, ESA, JAXA, CSA) and the 15 participating countries.

Memorize key modules like Zarya (first module), Unity (first US module), Destiny (US lab), Columbus (ESA lab), and Kibo (JAXA lab), understanding their respective contributions. Note the orbital altitude (~408 km) and inclination (~51.

6 degrees). Crucially, remember the planned decommissioning year (2031) and the concept of controlled re-entry.

Pay close attention to the vehicles used for crew rotation (Soyuz, Crew Dragon, Starliner) and cargo resupply (Progress, Cargo Dragon, Cygnus, HTV). Understand the fundamental purpose of the ISS – microgravity research – and be able to identify the broad categories of experiments conducted (human physiology, materials science, Earth observation).

Current affairs are paramount: track recent crew changes, significant resupply missions, and any policy statements regarding the ISS's extension or the development of commercial LEO destinations. For instance, the Boeing Starliner's crewed test flight in 2024 is a high-probability question area.

Practice MCQs that test your knowledge of these facts, often involving identifying correct/incorrect statements or matching modules to countries. A strong grasp of these specifics will ensure you can confidently tackle ISS-related questions in Prelims.