Colossal Dying Star Saved Earth from Being a Hostile Ocean World

Extreme Ocean World


If a massive star in the birth environment of the Sun –a yellow G2 dwarf star, one of a trillion stars in the Milky Way–had not injected radioactive elements into the early solar system, our home planet could be a hostile ocean world covered in global ice sheets. Some astronomers now think that every Sun-like star has at least one ‘Earth like’ planet in the so-called ‘habitable zone’ around a star, the region where liquid water can exist.