Next, clouds of this hydrogen gas had to condense to form the first main sequence stars. Most of these first stars had the mass of our sun but a rare few had a mass more than 20 times that of our sun. Large atoms up to the size of carbon and oxygen were fused in the core of red giants that evolve at after a 10 billion year burn from stars with one solar mass. Pressure and temperature inside red giants was not enough to produce heavier atoms by fusion. However, the larger stars burn through the main sequence in about 10 million years and then collapse to form a supernova.
Pressures are so high inside a supernova that most atoms in the periodic table are produced.
An explosion of a supernova scatters atomic dust and gas clouds that again condense into another sun. Our sun condensed about 4.6 billion years ago from a gas cloud that was enriched with atoms from the explosion of at least one if not several supernovas. First, the size of the universe was approximately the size of a dime. Then after about 10 -5 seconds it had expanded to the size of our solar system. According to all known physics, nothing has the capability of moving at such speeds.