Get out your Martian spelunking gear: NASA has found what appear to be seven cave entrances on Mars. 

The Mars Odyssey spacecraft relayed images of the dark, nearly perfectly circular features ranging in diameter from 328 to 820 feet.

At first the dark spheres puzzled scientists, but Odyssey's infrared camera then checked the daytime and nighttime temperatures of the circles and suggested they were, in fact, openings to subsurface spaces. 

The fossilised remains of six infant dinosaurs that died in a volcanic mudflow have been found in China. 

A group founded after a woman claimed to have seen apparitions of the Virgin Mary in a pine tree has been refused recognition by the Vatican. 

Parallel universes really do exist, according to a mathematical discovery by Oxford scientists described by one expert as "one of the most important developments in the "history of science".

The parallel universe theory, first proposed in 1950 by the US physicist Hugh Everett, helps explain mysteries of quantum mechanics that have baffled scientists for decades, it is claimed.