Voyaging spaceships may soon be able to top off their fuel tanks in space, just as cars and trucks do here on Earth. Engineers at the Massachusetts Institute of Technology MIT in Boston are suggesting establishing off-Earth propellant depots to fuel future missions to the moon. Such en-route stations would mean spacecraft could launch with less fuel on board and hence carry heavier loads, such as larger scientific experiments. This is not a new idea, but previous proposalsto solve the problemhave usually been pricey. One, for example, explored the possibility of setting up a fuel-manufacturing station on the lunar surface, from which tankers would be sent to refill floating depots. Read More at Space.com.