New Horizons is currently cruising beyond the solar system's edge, where light pollution caused by sunlight bounces off dust and debris.
The rare sighting is an opportunity to see the birth of a comet as it starts to become active, researchers say.
Pluto may possess an icy outer shell hundreds of km thick atop an ocean of water perhaps mixed with salts and ammonia, with a solid rocky core below.
Arrokoth, imaged by NASA's New Horizon, is located 6.6 billion km from Earth and is part of the solar system’s original building blocks.
The planet was named Ultima Thule after a mythical European land that is beyond the borders of the known world.
NASA has found evidence for methanol, water ice, and organic molecules on Ultima Thule's surface.
The finding may spark new theories on how such primitive objects formed early in the solar system.
Planet Nine could just be a clump of smaller objects that appear as one, single 'planet'.
The small, icy rock is seen spinning like a propeller on its centre – like a tumbling snowman!
The explorer travelled 4 billion-mile to a frozen rock at the edge of the solar system.
NASA will ring in the New Year with a live online broadcast to mark flyby of the Ultima Thule.
New Horizons will fly-by of the farthest object ever studied by a spacecraft on New Years Day.
Plutonium-powered New Horizons was launched in 2006 and is a days away from flying by Ultima Thule.
The New Horizons probe, which flew past Pluto in 2015, is set to encounter the Kuiper Belt object.
The object likely formed in the asteroid belt between Mars and Jupiter and has been flung billions of kilometres from its origin to its current home in the Kuiper Belt.
NASA's New Horizons sets a record for capturing the farthest images from Earth, at a distance of 6.12 bn km
The new images released by NASA on 8 February were captured by New Horizons when the spacecraft was more than 6.12 billion km away.
NASA's New Horizons spacecraft sets new record by capturing the farthest image from Earth by a spacecraft
The new images released by NASA on Thursday were captured by New Horizons when the spacecraft was more than 6.12 billion km away.
Which of these two NASA missions will finally make it will be known only in 2019.
You can now help give a new nickname to the next flyby target of NASA's New Horizons mission, 2014 MU69
The object has a rather mundane name, 2014 MU69 and NASA is asking for help in coming up with a more exciting name for the object.
The observations will help scientists better understand the size, shape, orbit and environment around 2014 MU69.