“New Horizons has detected numerous small, exposed regions of water ice on Pluto,” NASA noted in the press release. NASA doesn’t know yet why water appears on some regions of Pluto and not others, but it notes that Pluto’s watery regions are a deep red color.“I’m surprised that this water ice is so red,” Silvia Protopapa, New Horizons scientist at the University of Maryland, College Park. “We don’t yet understand the relationship between water ice and the reddish tholin colorants on Pluto’s surface.”..’

Source: Motherboard