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Q: In 1950, which Russian astronomer revised the Nebula hypothesis; proposing that the Sun is surrounded by a solar nebula consisting mainly of hydrogen and helium as well as dust?
  • A. Victor Safronov
  • B. Naum Idelson
  • C. George Gamow
  • D. Otto Schmid
Correct Answer: Option D - In 1950, Otto Schmid (Russian astronomer) modified the 'nebula hypothesis'. He proposed that the Sun is surrounded by a solar nebula consisting primarily of hydrogen and helium as well as dust.
D. In 1950, Otto Schmid (Russian astronomer) modified the 'nebula hypothesis'. He proposed that the Sun is surrounded by a solar nebula consisting primarily of hydrogen and helium as well as dust.

Explanations:

In 1950, Otto Schmid (Russian astronomer) modified the 'nebula hypothesis'. He proposed that the Sun is surrounded by a solar nebula consisting primarily of hydrogen and helium as well as dust.