Alien invasions are a staple of fiction, but many of the reasons given for attacking Earth fall apart under basic scrutiny. A civilization capable of crossing interstellar space would not need our ...

Rising temperatures and more tourists are making it easier for non-native plants and animals to get a foothold in remote northerly regions and invade the Arctic, a new study warns ...

Two rival teams — one using machine learning, the other human eyes — race to find the first spacecraft to soft-land on the moon.