Article
BY Salma ghazala
Stars And Panets Formation
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How do stars and planets form to build a solar system just like ours?
Did you know that the stars you see when you look at our big dark sky are not eternal? Did you know that stars are just like humans in a way that new stars are constantly being born while old ones are dying? Guess what? It's true. In fact, our own star, the one that hold the whole solar system together, "The Sun", was born about 4,5 BILLION years ago along with the planets around it. Long time! So if we want to know and understand how we got here, we should try to figure out how stars and plants for in our Galaxy.
This process is managed by the imbalance between pressure and gravity. The gas and the dust that are in the Interstellar Medium, as in the centre of the star, has an internal pressure strongly related to it's temperature and density. At some point, a small piece of a larger interstellar, the core, could can become very compressed and condensed to the point where it's mass and gravity are big enough to overcome it's internal pressure. At this point, the pressure can no longer support the greater weight of the core and thus it begins to collapse under the force of gravity. So, it becomes smaller, denser and finally, hotter. This stage is called the "protostellar" stage. The young fetal protostar is still is still surrounded and shield by it's natal envelope.