You say this like a faith or belief; how can you assert it was like this?
Astronomers now have such idea, but who says it is correct; did you yourself see the creation of the planets, or you only believe it because they told you this in the school?
I see it is more logical that the planets originated from one old sun, which had been transformed into an earth after having a thin cold crust,
then when that old sun burst, it broke up into nine big pieces (different in sizes) which have been the present planets: nine planets including the planets of the Asteroids which was between Mars and Jupiter.
Likewise when our present sun will burst, it will break up into many pieces which will be the new planets of the next solar system.
Google search <the planets together with the Earth were one object, then it was broken up into nine pieces>
http://www.quran-ayat.com/universe/index.htm#Formation_of_the_Planets_
Our star, the Sun, won't go supernova. It is too small and doesn't have enough mass to do so. Instead, in about five billion years from now, it will grow into a red giant and will get so large it will consume Mercury, Venus, Earth and maybe Mars.