Pluto is famous for its big, heart-shaped surface feature ... and scientists have been trying to decode how this unique structure formed. After years of extensive research, an international ...

Related: Why is Pluto not a planet? "Most thought Sputnik Planitia was of impact origin, but nobody had been able to explain its distinctive pear shape ... the internal structure of those ...

Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...