The US space agency NASA says that more evidence of possible water plumes erupting from the surface of Jupiter's icy moon Europa has been spotted. <br/><br/>The latest finding has given scientists fresh hope that a robotic spacecraft could one day fly past these potential plumes and learn about their contents without having to drill miles deep into the moon's icy shell. <br/><br/>Using ultraviolet images taken by Hubble, a space telescope that was launched in 1990, the potential plumes are seen around the southern edge of Europa and appear as dark fingers or patches of possible absorption. They were spotted over the course of 15 months in 2014 when scientists observed Europa passing in front of Jupiter.