The accretion theory: happens as a cloud of gaseous material and dust contracts under the extreme forces of gravity. Spinning mass forms a disc, probably with a bulge at the centre where a warm protostar undertakes a gestation period. And then eventually the central region of this locality collapses under the hostile force of gravity, and allows the centre to continuously heat, as the ambient gases continue to gather toward its core. From then on, the protostar dispenses and radiates much of its heat and ejects matter outward from its polar regions, where the disc itself offers little restriction to this process. And during this period, a lot of the protostar`s dust and debris is removed toward the newly forming solar-system`s periphery. From there, fusion commences at the star`s core, and the star begins its active nuclear life. But it should be remembered by the reader, only stars that are 6 percent or more than the mass of the Sun can attain temperature and pressure in the core which is required to initiate fusion. The disc at this stage either disappears entirely - of forms embryonic planets.

Planetoids develop: when matter swirling around an emerging star forms small pellets which collide and make larger bodies, we just called `Planetoids`. They coalesce at that point to form large planets with tracks of mostly empty space between them. And in the inner system, light gases are blown away by the star`s radiation to leave large rocky planets, and moons behind.

No one knows: how many stars might actually have planets orbiting them. First generation stars which form from hydrogen and helium only, might have planets around them, but these might only be gas giants like Jupiter devoid of a rocky core. For Earth like planets to build, the star must be a second or third generation with a hydrogen and helium cloud laced atmosphere with heavier elements. And since our Sun if reasonably typical, it seems highly unlikely other stars will not have similar solar systems to our own. But even with today`s modern telescopes, we do not have enough observational power to see directly whether this is the case or not! However, our near neighbour, Barnard`s star wobbles as it moves across the sky. Calculations currently show that the wobble of Barnard`s star could be caused by the gravitational effects of....