The scars on Ceres should have softened by now. That was the long-running problem. If the dwarf planet’s crust held a great deal of ice, many of its craters should have slowly sagged over geologic ...

For decades, some scientists argued that our solar system showed signs of ancient catastrophe. A missing planet between Mars and Jupiter was believed to have shattered, leaving behind the asteroid ...

The scars on Ceres should have softened by now. That was the long-running problem. If the dwarf planet’s crust held a great deal of ice, many of its craters should have slowly sagged over geologic ...