A teaspoonful of their matter would weigh as much on Earth as an elephant—5.5 tons ... greatly outshines its white dwarf companion, Sirius B. At 8.6 light-years away, Sirius B is the nearest ...

But a hundred thousand years ago, in the chilly depths of the Ice Age, multiple species of elephant roamed the earth: from dog-sized dwarf elephants to towering woolly mammoths. These gentle ...