Neptune’s oddball moon Nereid may be the sole remnant of an earlier system, formed near the planet rather than being pulled in from afar. More

At some 60 billion times the mass of the sun, this dark void could be home to a pair of black holes that are due for a cosmic collision. More

Planetary scientist Candice Hansen-Koharcheck championed the importance of space imagery. Her legacy lives on in every pixel that comes back to Earth. More

A brief stellar eclipse suggests the tiny 2002 XV93 has a thin atmosphere — a first for any solar system body farther from the sun than Pluto. More

The Nu ring seems to be fed by unknown rocky bodies, whereas the Mu ring appears rich in water ice and linked to the moon Mab. More