The heavy elements are formed when a supernova explodes. That happens quite frequently, when a star suddenly increases in brightness by a huge amount for a few months. If a supernova is close to us it can be seen as a new star, and that happens about twice in 1000 years.
It was formed by the big bang but nobody knows how it was formed or what there was before the big bang
Everything happened after the big bang.
Presumably the big bang.
A theory that the universe formed in a huge explosion
a huge blast.
The Universe.
No. Not much known during the Big Bang, but the big bang was 4.5 billion years ago, and it is today. Earth was formed once the big bang cooled down, and the big bang formed petrol in the ground because everything has been molten and formed petrol and got buried by the radiation when the bang cooled down and formed Earth.
A Big Bang
The big bang theory has nothing to do with the formation of planets.
big bang
by the big bang
yes