Scientists in the US have announced on Wednesday the discovery of the smallest moon yet around the icy orb if Pluto, bringing the count of its known moons to five.<br /><br />"We're not finished searching yet," said Hal Weaver of Johns Hopkins University, who thinks there may be more.<br /><br />The discovery was made by a team of scientists who used the Hubble Space Telescope to scout out Pluto's neighborhood ahead of a NASA spacecraft that's scheduled to arrive in 2015.<br /><br />The newfound moon, known as P5 until it gets a proper name, appeared as a faint fleck in the Hubble images. <br /><br />Scientists estimated the mini-moon to be 9km to 24km across, smaller than the still nameless one that they spotted last year, which is 12km to 33km wide.
