For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

We have discovered thousands of exoplanets in the last few decades, while the number of planets ... Neptune's orbit. In a recent paper, the team looked at long-period objects that crossed the path ...

Claims of a "rare planetary alignment" are misleading; it's just visible planets. A true "golden conjunction" occurs on Sept. 8, 2040.

The same year that Pluto was ignominiously stripped of its status, a paper was published theorizing that there was another planet, a very big planet, beyond Neptune. The Planet Nine theory was ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...

A planet-sized visitor possibly visited the solar system billions of years ago and permanently changed the cosmic neighbourhood by warping the orbital path of four outer planets of the system, a ...

Planets orbit the Sun in roughly circular paths, and moons orbit around planets. Asteroids and comets move in paths which are more oval in shape. The Sun’s gravity holds all of these objects ...