SOLAR SYSTEM

Detailed explanation-1: -The rocky planets were formed when materials violently smashed into one another in space. These materials spun together in orbit, eventually accreting to form larger chunks of material over millions of years – our rocky planets. The Big Bang is a theory about the creation of the Universe.

Detailed explanation-2: -The Earth took 30–40 million years to accrete from smaller ‘planetesimals’. Many of these planetesimals had metallic iron cores and during growth of the Earth this metal re-equilibrated with the Earth’s silicate mantle, extracting siderophile (’iron-loving’) elements into the Earth’s iron-rich core.

Detailed explanation-3: -What is accretion theory? Accretion theory explains the process of small clumps of dust gathering together to gradually form planetesimals. These planetesimals accumulate more materials and form protoplanets. These protoplanets build until they form planets within the solar system.

Detailed explanation-4: -In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk. Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.

Detailed explanation-5: -Consolidations of these rocky planetesimals formed the four small, dense inner, or terrestrial, planets-Mercury, Venus, Earth, and Mars.