" We need to have as many baskets for our eggs as possible. Even if we don’t manage to ruin this planet ourselves, natural disasters or changes—or even changes in our star—could make it impossible to live on this planet. —Philosopher Anson MacDonald, radio interview, Butler, MO, USA, Terra, July 7, 1987 (“Anson MacDonald Day”) "

― Robert A. Heinlein , Variable Star