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The correct answer is option (b): a piece of matter which has entered the earth’s atmosphere from outer space. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 1995, GS Paper 1, as Question 1. It falls under Science & Technology > Space Technology & Astronomy.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 69 questions from Space Technology & Astronomy (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.