Pluto, classified as a planet until the discovery of Alice in 2005, sits on the Kuiper Belt near Neptune. In 2015, the NASA spacecraft New Horizons flew a space rock, where it captured an incredible photo of its atmosphere . However, he made a far more interesting discovery the short time he remained in orbit.
Brian Cox revealed during his BBC series The Planets that scientists have noticed "something strange" in particular about an area.  He said earlier this year: "By far the most recognizable feature is the region known as Tombaugh Regio, or to give it its more popular name – the heart of Pluto.
"The western part of the heart is called Sputnik Planitia.
'A giant plane of frozen nitrogen, methane and carbon monoxide extending over a million square kilometers.
"And at its end is a range of mountains made up of clear, frozen water ice that rises 6 km above the plain.
"But there is something very strange about the region, something that sets it apart from the rest of this dwarf planet."
Dr. Cox went on to explain how the area looks like an anomaly of the re-st. on the world.
He added: "The surface of Pluto is covered with craters, the scars of impacts that have occurred over many billions of years, just like the surface of our Moon.
“Unless you look at Sputnik Planitia, it's absolutely smooth, there are no craters at all, not a single one.
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"So what could happen is that there is a source of deep down heat that melts the nitrogen ice and causes it to rise, cool and then fall again, and these currents continually reappear in the zone.
"This small world like Pluto is still active was a huge surprise.
"Our best theory of how this could be is that somewhere deep inside it there are radioactive elements that generate heat as they decompose."
Dr. Cox went on to reveal how scientists believe that beneath Pluto can hide an ocean of water is a surface.