Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.

The Triumph of Neptune and Amphitrite, 1630s. Frans Francken (Flemish, 1581–1642). Oil on copper, mounted on wood; framed: 36.2 x 43.8 x 3.8 cm (14 1/4 x 17 1/4 x 1 1/2 in.); unframed: 23.5 x 30.9 cm ...

It's big, cold, blue and 4.3 billion kilometres away. But astronomers using new optics technology have taken an image of Neptune that is nearly as sharp as those taken from the orbiting Hubble ...

But even then, the very faint rings of Neptune and the background stars were invisible, since the Voyager camera was set to take exposures of the relatively bright cloud tops of the planet. And ...