Stellar evolution is the life cycle of a star. a cycle suggests that upon death of a star, another star is born. how is this possible?

This is possible because when a star dies, it basically expands to its maximum (explodes). Therefore, the materials of the exploded star mix with the primeval hydrogen of the Universe. Later, other stars are formed out of this mixture. Thats also how the sun was formed. :)

Ithink that its like 15 mph.