Just when do comets get their signature coma? Conventional wisdom says it only happens when they get close enough to…
A new study based on New Horizons data has conducted the most accurate measurements of the Universe's background light to…
A comet-eating black hole the size of a planet? It's possible. And if there's one out there in the distant…
Oh Planet Nine, when will you stop toying with us? Whether you call it Planet Nine, Planet X, the Perturber,…
Hey Pluto, Sedna, Haumea, Makemake Et al.: You’ve got company! While searching for distant galaxies and supernovae, the Dark Energy…
The KBO formerly known as Ultima Thule (2014 MU69) has officially been named "Arrokoth", the traditional Powhatan-Algonquin language.
What's going on in the distant reaches of our Solar System? Is there a Planet 9 out there? Out in…
A newly-processed image of Ultima Thule provides the highest-resolution picture of the object to date.
Earlier this month, the New Horizons team managed to capture the first images of Ultima Thule, the Kuiper Belt Object…
According to a new study by a team from CU Boulder, Planet 9 may not be necessary to explain the…