Saturn holds the record for the most known moons of any planet in the solar system, with at least 146 confirmed satellites on ...

What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...

What can rocky planets orbiting in the outer parts of a solar system teach scientists about planetary formation and evolution? This is what a recent study published in Science hopes to address as a ...

Pop culture has been lying to you about what happens in outer space. See some of the wildest space rumors that NASA has ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...

(Ianm35/iStock/Getty Images Plus) The Solar System is one of the comforting constants of human existence. No matter what else ...

The transition from cluster to stream offers an extraordinary opportunity for exoplanetary science. Inside a dense cluster, ...