Birth of element II

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Before we get into the question where all these chemical elements are come from, we should ask one more basic question. That everything is made of atoms. But how do we know that? For example, think about a star even our sun. Nobody has gone to the sun, took a sample, and come back, right? How do we know that the sun is made of atoms? In some sense that's actually one of the major discoveries of our scientific progress that we have good evidence that all of the stars in the entire universe are made of atoms. And one very important tool for this is something called spectroscopy. 



If we take a piece of a glass called prism and let the light go through it, we would get separate different colors in a sort of rainbow like stripe. If we use a more advance devices then we can do this with much more greater precision .We can take the light coming from the sun, let it go through this device, for example grading, and then you can separate light all the way from red to violet.



So, this is meant to be actually a single continuous spectrum of colors coming from the sun.

And if we look at the picture, we notice one thing which is strange: the sun colors are missing, right? We see black lines, which mean that those colors are somehow missing in the sunlight. So what's going on there? And if we look closely at these missing colors, we actually can identify them as something we study in our laboratory.


                                                                   contd....

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