nearest planetary neighbour became a fiery hellscape while our own planet thrived. the missions are scheduled to launch at the end of the decade. an initial development budget of about £350 million has been allocated to the two missions. let's stay with space, because this evening, thousands of worms are on their way to the international space station as part of a mission to better understand how ageing affects human muscles. researchers said the effect of space flight on humans had long been a concern, with astronauts losing up to 40% of their muscle after six months in orbit. the worms share many of the same biological characteristics as humans and the hope is the research could also help shed light on developing new treatments for muscular dystrophies, a group of inherited genetic conditions that gradually cause the muscles to weaken. now it's time for a look at the weather with ben rich. good evening. after the very warm weather we had earlier on this week, today, temperatures dropped byjust a little for most of us, and we take that slightly cooler