Outer solar system

NASA’s New Horizons mission has set the distance for its New Year’s Day 2019 flyby of Kuiper Belt object 2014 MU69, aiming to come three times closer to MU69 than it famously flew past Pluto in 2015.

A new study sheds light on the chemical make-up of the planet, which lies around 4.5 billion kilometres from the sun.

Could the next flyby target for NASA’s New Horizons spacecraft actually be two targets?

NASA’s New Horizons spacecraft doesn’t zoom past its next science target until New Year’s Day 2019, but the Kuiper Belt object, known as 2014 MU69, is already revealing surprises.

Unlike Earth, this icy planet’s magnetosphere opens and closes every day.

The plane of the solar system is warped in the outer reaches of the Kuiper Belt, signaling the presence of an unknown Mars-to-Earth-mass planetary object far beyond Pluto, according to new research.

A NASA-led and NASA-sponsored study of potential future missions to the mysterious “ice giant” planets Uranus and Neptune has been released.

In the race to discover a proposed ninth planet in our Solar System, astronomers have observed several never-before-seen objects at extreme distances from the Sun in our Solar System.

The next target for NASA’s New Horizons mission – which made a historic flight past Pluto in July 2015 –– apparently bears a colorful resemblance to its famous, main destination.

Planet Nine—the undiscovered planet at the edge of the Solar System that was predicted in January 2016—appears to be responsible for the unusual tilt of the sun, according to a new study.