What process can new generations of stars be triggered by in dense environments?

Answer

Compression of surrounding interstellar gas by the expanding remnant

If a massive star explodes while still within its birth cloud, the expanding remnant can compress the local gas, potentially triggering the gravitational collapse of dense pockets into new stars.

What process can new generations of stars be triggered by in dense environments?
Spaceastronomysupernovaexplosionremnants