Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

At the center is the sun, a yellow dwarf star ... from the eight major planets to dwarf planets, comets, asteroids, and icy objects — revolves around it. The solar system also includes the ...

NASA’s Habitable Worlds Observatory, a planned infrared and ultraviolet space telescope, will specifically target Earth-like planets around Sun-like stars when it launches in May 2027.

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

A dazzling snapshot from ESO’s Paranal Observatory captures a rare sky parade — the Moon, a comet, and nearly every visible ...

An international team from Taiwan, Japan, and Australia used 40 years' worth of data from two space probes to track down what they believe are signs of this distant planet moving around our sun.