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 ...

A huge heart-shaped feature on the surface of Pluto ... While studying the heart feature, the team also focused on the internal structure of Pluto. An impact early in Pluto’s history would ...

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