DAR ES SALAAM, June 21 -- ACCORDING to the Big Bang theory, the universe began with a massive explosion approximately 12 to 10 billion years ago.

This event led to the formation of atoms, and as the universe expanded and cooled over time, it gradually evolved into the cosmos we know today.

About 4.6 billion years ago, a region within a giant interstellar molecular cloud underwent what scientists call a gravitational collapse, leading to the birth of the Sun.

Most of the matter in this collapsing region accumulated at the centre to form the Sun, while the remaining material flattened into a rotating disk.

This disk eventually gave rise to what we now call the Solar System.

The formation of the Solar System was a gradual process. Scien...