Pluto fifth Moon Styx.

Another moon has been discovered orbiting the dwarf planet Pluto.
This is the planet's fifth known satellite, and it was spotted by astronomers using the Hubble Space Telescope. Here is Nix moon as it is visible as a tiny speck of light also Hydra outer most moon, in the image below the moon – designated simply as P5 – is estimated to be between 10 and 25km (6-15 miles) across. For comparison, Pluto’s largest moon, Charon, has a diameter of over 1,200km, and our own Moon’s diameter is about 3,500km. Pluto and its five moons, including the newly-discovered P5 (circled). Image credit: NASA; ESA; M. Showalter, SETI Institute. As Pluto’s collection of moons is surprisingly complex for such a small planet. It’s thought that this moon system was formed from a collision between Pluto and another Kuiper belt object billions of years ago P4 named Kerberos / P5 Named Plutos Moon called Styx.

The New Horizons mission to Pluto keeps delivering the goods when it comes to pictures of the distant dwarf planet and NASA’s latest false-colour image is a real beauty. Combining four images from New Horizon's sensors, NASA have provided us with a dramatic view of the Sputnik Planum, the large plane on the surface, with what appears to be evidence of glacial movement to the southwest and northeast. Recent geological activity is something that many scientists had hoped to find but didn’t expect, so this news is a real treat for the New Horizons team.“We’ve only seen surfaces like this on active worlds like Earth and Mars,” said mission co-investigator John Spencer of SwRI. “I'm really smiling.” Data also suggests that the centre of the large expanse is rich in nitrogen, carbon monoxide and methane ices.

With only 4-5% of data received from the probe, New Horizons will continue to supply fascinating insights from Pluto deep into 2016, but there is still plenty of work to do, as Alan Stern, the New Horizons principal investigator, warns."Pluto has a very complicated story to tell; Pluto has a very interesting history, and there is a lot of work we need to do to understand this very complicated place." As in fact a historic photo taken by NASA's New Horizon space probe on its approach to Pluto. Shot at a distance of around 71 million miles (114 million kilometres), the image is New Horizon's first colour photo of the dwarf planet and its largest moon, Charon.

New Horizons has taken the first colour photo of its destination (image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute) It's over nine years since New Horizons left Earth, and the spacecraft's final destination is now only three months away.
On July 14, 2015 New Horizons will make a flyby of Pluto and its moons, returning the first ever close-up images of this icy world. Equipped with seven science instruments, the craft will perform a full analysis of Pluto, studying its geology, surface composition, climate and atmosphere, as well as its bevy of at least five moons. "Scientific literature is filled with papers on the characteristics of Pluto and its moons from ground-based and Earth-orbiting space observations, but we’ve never studied Pluto up close and personal,” says John Grunsfeld, associate administrator of the NASA Science Mission Directorate. “In [this] unprecedented flyby, our knowledge of what the Pluto system is really like will expand exponentially, and I have no doubt there will be exciting discoveries."