Pluto in colour: This image from NASA's New Horizons spacecraft was taken on July 13, 2015, when the spacecraft was 768,000 kilometers from the surface. This is the last and most detailed image sent to Earth before the spacecraft's closest approach to Pluto on July 14.

Pluto's surface: A detailed view of Pluto's surface constructed from multiple NASA Hubble Space Telescope photos taken from 2002 to 2003. Hubble's view isn't sharp enough to see craters or mountains, if they exist on the surface, but it reveals a complex-looking and variegated world with white, dark-orange, and charcoal-black terrain.

Pluto in false colour: A false colour image of Pluto captured by NASA's New Horizons spacecraft.

Pluto's moon: NASA's New Horizons captured this high-resolution enhanced color view of Charon just before the spacecraft made its closest approach to Pluto on July 14, 2015.

Pluto system: An artist's concept of the dwarf planet being orbited by its moons.

Colourful Pluto: NASA’s New Horizons spacecraft captured this high-resolution enhanced color view of Pluto on July 14, 2015. Pluto’s surface sports a remarkable range of subtle colors, enhanced in this view to a rainbow of pale blues, yellows, oranges, and deep reds.

Hazy Pluto: This image of haze layers above Pluto limb was taken by NASA New Horizons spacecraft.