Comets may bring ingredients for life most easily to clustered planets

Comets may be a key source for the building blocks of life, but the only planetary systems where those ingredients could survive impact may be ones with large stars or lots of neighbouring worlds

​Comets may be a key source for the building blocks of life, but the only planetary systems where those ingredients could survive impact may be ones with large stars or lots of neighbouring worlds Comets may be a key source for the building blocks of life, but the only planetary systems where those ingredients could survive impact may be ones with large stars or lots of neighbouring worlds