Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

A SpaceX launch early Wednesday morning sent a trio of spacecraft toward a destination almost one million miles from Earth. The missions—two for NASA and one for the National Oceanic and Atmospheric ...

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.

IMAP (short for "Interstellar Mapping and Acceleration Probe") is the primary payload on today's flight. The roughly $600 ...

The rate of finding these distant worlds has recently increased, with astronomers scrambling to accommodate the data ...

The spacecraft will study the solar system's edge, magnetic fields in interplanetary space, and remnants of exploded stars.

I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, astronomers detected a strange, fast-moving object racing toward the Sun. Named ...

NASA is set to launch three spacecrafts Tuesday with the goal of unlocking the mysteries of solar weather at the edge of our ...

The universe is a slow-changing place. While it's mostly true that the heavens and the deep-sky objects in it will look ...

Many planetary systems are born in slightly tilted protoplanetary disks, which would explain the misaligned orbits from the ...

Harvard astronomer Avi Loeb argued interstellar object 3I/ATLAS "could either visit us or release some mini-probes that ...

Humans are gambling the very stability of Earth's life support systems, scientists said Wednesday, warning that ocean acidity ...