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UPSC 1999: Which one of the following scholars suggests the earth’s origin from gases and dust particles?
(a)James Jeans
(b)H. Alfven
(c)F. Hoyle
(d)O. Schmidt
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Not attemptedCorrect Answer: (d) O. Schmidt
Russian astronomer Otto Schmidt proposed the Inter-Stellar Dust (Cloud) Hypothesis, explaining that the Sun captured surrounding gases and dust particles which then accreted to form the Earth and other planets ([geographynotes.com](https://www.geographynotes.com/solar-system/origin-of-the-solar-system-and-earth-geography/5593?utm_source=openai)). The other names listed advanced different theories (Jeans – tidal, Alfven – filament/protoplanet, Hoyle – super-nova), so option (d) is correct.
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Geography question?▼
The correct answer is option (d): O. Schmidt. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Astronomy & Earth–Sun System question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 110. It falls under Geography > Astronomy & Earth–Sun System.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Astronomy & Earth–Sun System?▼
UPSC has asked 27 questions from Astronomy & Earth–Sun System (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.