Carl Sagan, the famous astronomer said it first and was right."We are made of star stuff".We know that Carl Sagan was right because when astronomers point their telescopes at the stars and use a prism to break down light it separates the light into different colours, but more importantly, each element being fused within the star, absorbs the light at different wavelengths.
These absorption lines appear as vertical lines between the colours of the spectra and are different for each element. This is illustrated below.
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So when these light spectra are coming from stars, astronomers know which elements are being fused in each star. This gives each star a particular signature of elements.
The thing is, no matter where astronomers point their telescopes the variety of elements that are interpreted, the same 92 elements of the Periodic Table are revealed.
Material is spread throughout the universe via supernova explosions of dead stars, which recombine and recycle this matter into new stars which explode again.
This simple and amazing fact indicates that the mass of all the stars in the universe are made of the same star material that we find on Earth.
As all life on Earth is carbon-based, we are also made of the same material.
Listen to Neil DeGrasse Tyson explain this.
So you see, Carl was right.
"We are all made of Star Stuff".
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