If Jovian planets attracted hydrogen because of their large cores, why did the E

Question

If Jovian planets attracted hydrogen because of their large cores, why did the Earth not do so since it is about the size of a Jovian core?

Because there was never much hydrogen gas in the inner solar system.

Because hydrogen gas was blown out of the solar system before terrestrial planets had time to grow big enough.

The terrestrial planets did attract large hydrogen atmospheres, but lost them because of the solar wind.

Because only an icy core can attract hydrogen gas.

Because there was never much hydrogen gas in the inner solar system.

Because hydrogen gas was blown out of the solar system before terrestrial planets had time to grow big enough.

The terrestrial planets did attract large hydrogen atmospheres, but lost them because of the solar wind.

Because only an icy core can attract hydrogen gas.

Explanation / Answer

In the warmer inner solar system, planetesimals formed from rock and metal, materials cooked billions of years ago in cores of massive stars. These elements made up only 0.6% of the material in the solar nebula (and the faster collisions among particles close to the Sun were more destructive on average), so the planets could not grow very large and could not exert large pull on hydrogen and helium gas.Even if terrestrial planets had hydrogen and helium, proximity to Sun would heat gases and cause them to escape. Hence, terrestrial planets (Mercury, Venus, Earth, and Mars) are dense small worlds composed mostly from 2% of heavier elements contained in solar nebula.

So, the correct option is B (Because hydrogen gas was blown out of the solar system before terrestrial planets had time to grow big enough.)

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