Part of Pluto's Heart Was 'Born Yesterday'

Pluto has a surprisingly youthful heart — the smooth, round region on the dwarf planet'ssurface is no more than 10 million years old, a blink of an eye in the 4.5-billion-year lifetime of the solar system. The large,western lobe of the "heart" on Pluto's surface is also known as Sputnik Planum, and it is strikingly free of craters. Researchers with NASA's New Horizons mission said this is surprising, because such processes require an internal heat source, which is often lost in small bodie