Why are the four inner planets in our solar system dense and rocky while the outer planets are gaseous?

A) In the young universe hydrogen and helium where the only elements.

B) Intense radiation from our Sun blasted much of the hydrogen and helium into the outer reaches of our Solar System, while heavier elements remained closer.

C) Planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star.

D) A small contending planet, about one-tenth the size of Earth, must have collided with Earth about 4.45 billion years ago.

The four inner planets in our solar system dense and rocky while the outer planets are gaseous because planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star.

What is solar system?

The solar system consists of the Sun and everything that orbits, or travels around, the Sun. This includes the eight planets and their moons, dwarf planets, and countless asteroids, comets, and other small, icy objects.

The inner planets are made of rocky material, which has higher density; these are often known as terrestrial planets. The outer planets are made mostly of low density gases; these are often known as Jovian planets.

And also the four inner planets have shorter orbits, slower spin, no rings, and they are made of rock and metal. The four outer planets have longer orbits and spins, a composition of gases and liquids, numerous moons, and rings.

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