Newslink: Best-Ever View of Distant Object Ultima Thule Reveals Weird Circles, Pits
The best-ever photos of Ultima Thule have made it down to Earth, and they heighten the intrigue about the frigid and faraway world.
https://www.space.com/new-horizons-best-view-ultima-thule.html
Wow. It looks like the researchers are unsure if the circle features are impact areas, sublimation pits, or collapse pits.