SpaceComet 67P is hiding nitrogen that could solve a solar system mystery The Rosetta spacecraft’s measurements of comet 67P have revealed a hidden source of nitrogen that may help us learn how giant planets – and even life – formed ¿ìè¶ÌÊÓÆµ
VideoWhen will we hear from aliens? We may already have done so It is just a matter of time before we hear from alien civilisations, argues Avi Loeb – in fact, we may already have done so Video