If a moon is big enough and far enough from its planet, it can host its own smaller moon, called a ‘moonmoon’ - and four worlds in our solar system fit the bill
Richard Branson has said that his space flight company, Virgin Galactic, will go to space “within weeks”. Here’s what you need to know about his claims
Rabbits avoid nibbling grass in areas scattered with predator droppings – particularly if those predators have been fed on bunnies
For much of human evolution our ancestors may have encountered only a few hundred people in their lives – but we can each recall about 5000 distinct faces
If big rocks fall far enough they can explode with more energy than any non-nuclear bomb – and the ensuing shockwave can snap large trees half a kilometre away
The coelacanth fish has scales that can change their internal structure if they are pierced by a predator to stop cracks spreading
The Galapagos archipelago is a growing tourist attraction, which is adding to the problems faced by the islands’ famous giant residents
The social network Google+ is shutting down for regular users, after it discovered a flaw in March that exposed personal information of up to 500,000 people
Researchers are calling for recognition of mental health problems caused by excessive gaming, gambling and social media, but lumping these together may not be right
Three people played a game of Tetris using brain-reading caps. This is the first time several people have collaborated through brain-to-brain communication