NASA’s New Horizons space probe is currently speeding towards a mysterious Kuiper Belt Object known as MU69. Recent observations of the distant object indicate a very reddish surface—possibly even redder than the splotches found on Pluto. This small Kuiper Belt object (KBO), which measures about 20-30 miles (30-45 km) in diameter, is located 1.6 billion miles (2.6 billion km) beyond Pluto. By the time New Horizons gets there on January 1, 2019, it’ll be about 43.