Pluto just never ceases to fascinate. NASA scientists recently discovered the dwarf planet is home to hills that float and move about.

Pluto just never ceases to fascinate.
NASA scientists recently discovered the dwarf planet is home to hills that float and move about.
The unique geological features were spotted in the region unofficially known as Sputnik Planum. 
Individually they measure in the one to several miles wide range, but often appear in clusters as shown in an image released by NASA.
One of the larger of the groupings is estimated to cover a 37 by 22 mile area. 
Their floating and mobile nature is a matter of composition. 
Experts believe the hills are made of water ice, while the surface beneat