Space is mind-bogglingly big. I'm amazed to hear that, today, the European Space Agency's Rosetta probe is entering orbit around a comet hurtling through space 400 million kilometres from Earth.
Rosetta was launched ten years ago and has travelled 6 billion kilometres to catch up with the fast-moving comet. Among the many scientific tests planned, the mission will search for chemical building blocks of life on the comet's surface. I wonder what it'll find?