Ultima Thule (pronounced TOO-lee). “This is truly the most primitive object ever encountered by a spacecraft,” said Hal Weaver, project scientist at the Johns Hopkins Applied Physics Laboratory.

Ultima Thule is the most distant object to be explored by a spacecraft Scientists are getting closer to understanding how the distant object known as Ultima Thule came to be. Nasa's New Horizons ...

The American space agency is waiting for a signal from its New Horizons probe to confirm that it has made a successful flyby of Ultima Thule. The craft should have hurtled by the 30km-wide icy ...