Probe visits 'spinning peanut' in deepest space
A NASA probe has reached the furthest cosmic object ever explored by humankind, revealing new clues to how the planets formed.
Ultima Thule, a space rock 22 miles long and nine miles wide, sits in the dark and frigid Kuiper belt, four billion miles from Earth, on the edge of the solar system.
The New Horizons probe flew by at 32,000mph, passing within 2,200 miles of the surface.
From there, it took 10 hours for an anxiously awaited "phone home" signal to reach mission control a...