Neptune’s true colour is a pale greenish-blue similar to that of Uranus, contrary to popular images that show it to be a much deeper shade of blue. Read more Mysterious dark spot on Neptune seen ...

Images from a space mission in the 1980s showed Neptune to be a rich blue and Uranus green. But a study has discovered that the two ice giant planets are both similar shades of greenish blue.

A planet’s opposition occurs when Earth passes between it and the Sun. As a consequence of that geometry, Neptune’s disk will appear to be 100% illuminated as seen from Earth. It will be 180º ...