If you want to make a solar system like ours — with a central star, rocky planets and gas giants — all you need is to begin with a cloud of molecular gas that’s cool enough and dense enough to collapse under its own gravity. So long as previous generations of stars have existed in great enough abundances, recycling their heavy, processed elements back into the Universe, when you get those new star clusters that form where the mass is most concentrated, you’ll have all the raw ingredients necessary for making a rich star system.

from Forbes – Tech http://ift.tt/1kqzdeC
via IFTTT