NASA’s New Horizons spacecraft became the first explorer to fly past the mysterious object - Ultima Thule, located some 4 billion miles from Earth.
This is a historic flyby of the farthest, and quite possibly the oldest, cosmic body ever explored by humankind.
Ultima Thule
Ultima Thule is located in the Kuiper belt in the outermost regions of the Solar System, beyond the orbit of Neptune.
It measures approximately 30 km in diameter, and is irregularly shaped.
Ultima Thule has a reddish color, probably caused by exposure of hydrocarbons to sunlight over billions of years.
Ultima Thule belongs to a class of Kuiper belt objects called the “cold classicals”, which have nearly circular orbits with low inclinations to the solar plane.