A star is born
by a huge cloud of gases and star dust called a nebula. A
nebula is when a star dies and new stars will be born from the gases
of the old stars that died. Gravity pulls clumps of gas together
and the gases get very hot and get so hot that they cause a nuclear
reaction and turn into stars. Clusters of stars can be from just a
handful of stars to hundreds and hundreds of stars. When stars are born
in clusters they call this a stellar nursery.
Once new stars are formed, a cluster of young stars leaves the nursery
and the hot gases from those stars help cause more new stars to be born
in the original nursery. Then, the first stars spread out even more and
get farther from the nebula and the ones that just formed continue
with the cycle that just keeps going on and on.