Invasive alien species are organisms introduced beyond their native ranges that establish, spread and cause ecological, economic or social harm. Their impacts include declines in native biodiversity ...

Alien invasion stories have been around for decades, and some of sci-fi's most interesting entries are often overlooked or completely forgotten today.

With Steven Spielberg’s new extraterrestrial film Disclosure Day just out, it’s the ideal time to watch Close Encounters of the Third Kind – perhaps the perfect UFO film, says film columnist Bethan ...