EVOLUTION OF NEPTUNE
Date: 23 September 1846
Activity: Astronomer Johann Gottfried Galle viewed Neptune through a telescope for the first time
Date: 10 October 1846
Activity: Neptune’s largest moon Triton was discovered
Date: 25 August 1989
Activity: NASA’s Voyager 2 flew by Neptune and came within just 3,000 kilometres (1,860 miles) of the planet’s north pole
Date: 1 July 2013
Activity: Neptune’s smallest moon S/2004 N1 was discovered during an analysis of older Hubble images
Date: 8 October 2013
Activity: Neptune’s ‘lost’ moon Naiad was spotted for the first time in 20 years. The tiny moon had remained unseen since the cameras on NASA’s Voyager 2 spacecraft first discovered it in 1989.