The unusual orbit of a possible dwarf planet, known as 2017 OF201, makes it less likely that our solar system contains a ...

Joseph channels his inner Carl Sagan to find out if discovering the mysteries of space is worth all the work, in his review ...

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

This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our solar system.