SUPERNOVA EFFECTS ON WORLD

Supernova can affect us in some important ways. First and foremost, we and much of the Earth are made of the material supernova created. According to current theories about the formation of the Universe, all of the original material in the Universe was hydrogen and helium, with very slight traces of some other materials. All the stuff we, and the Earth around us, are made of, like iron and oxygen and carbon, has come from that initial material being fused to form heavier elements in the cores of stars. But the heaviest elements, like iron, are only formed in the massive stars which end their lives in supernova. Our blood has iron in the hemoglobin which is vital to our ability to breath. So without supernova, most forms of life on Earth, including us, would not be possible. And much of the material the Earth is made of would not exist "scientifically", though as we already know the power of god, who created everything. 

Supernova's contribution to life. Illustration from: http://www.astrobio.net/albums/xsolar/abd.jpg

Supernova also create shock waves through the interstellar medium (the stuff between stars), compressing material there. Astronomers believe that these shock waves are vital to the process of star formation, causing large clouds of gas to collapse and form new stars. No supernova, no new stars.

Source : http://imagine.gsfc.nasa.gov/