The Rosetta-Philae mission was groundbreaking, but Philae’s landing on comet 67P didn’t go as planned. Why did the lander ...

CNN’s Ben Wedeman dives deep underground in Rome to explore the Aqua Virgo, an ancient aqueduct that continues to supply water to the Trevi Fountain and other landmarks.

On the world's first Asteroid Day, Nina Burleigh discovers that Nasa has already commissioned a team of 'planetary defenders' ...