SOLAR SYSTEM

Detailed explanation-1: -The solar wind swept away lighter elements, such as hydrogen and helium, from the closer regions, leaving only heavy, rocky materials to create terrestrial worlds. But farther away, the solar winds had less impact on lighter elements, allowing them to coalesce into gas giants.

Detailed explanation-2: -The terrestrial planets, as well as the larger moons and asteroids, have spherical layers that were created by melting and differentiation. Heavier elements sank to the center, forming iron-rich cores. Lighter materials were buoyed upward to form the outer rocky layers.

Detailed explanation-3: -The principal cause of internal heat in a terrestrial planet is at it’s core. The core’s heat is due to a hot atmosphere, tidal heating, and the radioactive decay of elements. Tides can be powerful at creating heat on terrestrial planets.

Detailed explanation-4: -In the areas closer to the Sun, it’s too warm for the lighter gases to condense there, and so the larger gas and ice giants tended to form further from the Sun.

Detailed explanation-5: -Flexi Says: The rocky planets are closer to the sun than the gas planets because the temperature near the sun is perfect for condensing rocks and metals while the gas planets can form away from the sun where the temperature is low enough for condensation of gases.

Detailed explanation-6: -Why was the earth so hot when it formed? Gravitational contraction/accretion: gravity caused small bodies of rock and metal orbiting the Sun to smash together. These collisions caused temperatures and pressures to increase.