"We are just beginning to try and figure out quantitatively how all this might smooth a surface," Dr. Thomas said in the May 17, 2013 New Scientist.
On March 27, 2012, Cassini made its closest flyby yet over Enceladus's "tiger stripes". In a string of enticingly close passes over the dazzling moon, the spacecraft saw more hints that watery jets may be shooting out into Space from an immense subsurface sea. The jets, tearing through cracks in the moon's icy crust, could lead back to a zone harboring living tidbits.
When the American astronomer James Christy discovered Pluto's largest moon Charon back in 1978, astronomers were quick to calculate the mass of the system. Pluto's mass was hundreds of times smaller than the mass originally estimated for it when it was first discovered in 1930. With Charon's discovery, astronomers suddenly acquired a new understanding that something was fundamentally different about Pluto.