The robot probe Philae has since been hitching a lift on Comet 67P/Churyumov-Gerasimenko as it orbits the Sun. Here is a quick look at the comet - and what it could teach us - in 60 seconds.

31,515 people played the daily Crossword recently. Can you solve it faster than others?31,515 people played the daily Crossword recently. Can you solve it faster than others?

Pluto displays a remarkable variety of geological processes, many of which are unique. Features captured by New Horizons include jagged mountain peaks abutting both a large putative icy volcanic ...