NASA's New Horizons space probe has spotted possible clouds hovering over Pluto, indicating that the weather on the icy dwarf planet is more complex than imagined. <br/><br/>Alan Stern, principal investigator from Southwest Research Institute in the US opined that Pluto's complex, layered atmosphere is hazy and appears to be mostly free of clouds. <br/><br/>Stern said that If there are clouds, it would mean the weather on Pluto is even more complex than we imagined.<br/><br/>The New Horizons spacecraft is presently 5.5 billion kilometres from Earth and about 540 million kilometres beyond Pluto, speeding away from the sun at about 14 km every second.