Pluto has a heart. Scientists discovered that its bleeding.

Pluto's famous heart is bleeding, according to new research, hinting that the distant world is more alive than it looks.That bright, heart-shaped glacier has been a fan favorite ever since NASA's New Horizons spacecraft flew past the cold outer world in 2015. Scientists now say the heart isn't just the dwarf planet's special cutie mark, it may be slowly leaking liquid — yes, liquid — onto the surface. Researchers say dark streaks along the heart's rim are actually stains left by