The Sun Had Sisters
-The shock wave from the supernova (which is rich
in heavy elements) will sweep up interstellar gas
until the total supernova remnant will be a shell
of hundreds -or even thousands- of solar masses
of gas, sometimes with a neutron star or a black
hole in the center remaining of the star.
If one part of the supernova remnant has swept up
enough gas, the compressed gas can begin to contract
under its own gravity
to create the next generation of stars.
Typically, when a big nebula begins to collapse,
the heaviest fragments contract first, creating
short-lived giant stars that explode and seed the
rest of nearby space with heavy elements.
The shock waves then fragment and contract into new
proto-stars, with sizes distributed from many very
small red dwarf stars to a few bigger stars.
Yours Birger Johansson, Sweden