The critical temperature where Venus would start to solidify an inner core is 4940 ± 70 K. And the moon doesn't have any molten core. Why does Mercury (at 5.43 g/cm3 ) have a higher average density than the Moon (at 3.35 g/cm3 )? So it could easily have iron there. New research, however, suggests that some of Venus' crust does get recycled, just through a radically different process—one that may have been active early in Earth's history. Mercury has the higher density because it has a large iron core while the Moon has a small iron core. Similarly Venus’ core fluid temperature at its CMB, T M (P CMB), is approximately 3630 ± 15 K, but at the centre, the temperature is above T S (P centre) since Venus does not have an inner core. Inner core of Earth (and many other planets) are solid because of (what I think is pressure). Having a mean density of 3,346.4 kg/m³, the Moon is a differentiated body, being composed of a geochemically distinct crust, mantle, and planetary core.This structure is believed to have resulted from the fractional crystallization of a magma ocean shortly after its formation about 4.5 billion years ago. Finally, if it is outer core you meant, and you didn't count the moon as a "planet", would you count extrasolar planets as "planets".
Why are features like the Moon's maria not observed on Mercury? Research suggests that each planet consists of an external crust, a thick layer of rock beneath it called the mantle and a molten core at the center. Based on its density alone, Venus must have an iron-rich core that's at least partly molten — so why does it lack the kind of global magnetic field that Earth has? Please clarify, but to your current question, no. If Lutetia does have a molten core, it would be the first asteroid known to be partially differentiated into a molten interior and cooler exterior, as Earth is. Also, you said inner. Complete Question Explanation Resolve the Paradox. Another quality that Earth and Venus are thought to have in common is the internal structure below the surface. As the solar system began to form about 4.5 billion years ago, planets were born from collisions of dust and rock.
The interior is not fully understood yet, however. The correct answer choice is (B) The scientist quoted in this stimulus points out some of the similarities between Earth and Venus: Both planets have a hot molten core, and each needs to get rid of the excess heat that is generated by these molten cores. Venus may have a metallic core.