Invasive species costing Africa $3.66 tn a year: study

Invasive species introduced by human activity are costing African agriculture some $3.66 trillion every year—around 1.5 times the combined gross domestic product of all African countries—new research showed Thursday.

Red dwarf stars might be best places to discover alien life

Red dwarfs are the most common type of star in the universe, and nearly every one of these stars may have a planet located in its habitable zone where life has the best chance of existing, a new study concludes.

Are aliens watching old TV shows?

You've probably heard the trope about how aliens have been watching old episodes of "I Love Lucy" and might think these are our "historical documents". How far have our signals reached?

Is calling E.T. a smart move?

In 2008, NASA beamed the Beatles song "Across the Universe" into deep space, sending a message of peace to any extraterrestrial who happens to be in the region of Polaris, also called the North Star, in 2439.

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