More than 2,500 alien plant species could find suitable conditions in the Arctic, especially in northern Norway and Svalbard.

The 300 million-year-old Tyrannoroter heberti had an extra set of conical-shaped teeth, indicating it likely ate plants. It’s one of the earliest species to do so.

But the real truth is that alien life on other planets could be even stranger than floating balloons or amorphous organisms ...

By 1768, just 27 years after Steller’s discovery, the sea cows had already gone extinct. It was one of only a small number of megafaunal extinctions at the time, one that marked the first marine ...