New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

A new study from NYU Abu Dhabi has found that high-energy particles from space, known as cosmic rays, could create the energy ...

A new paper led by a York University professor and published today in Nature Astronomy introduces a simple theoretical ...

The Very Large Telescope in Chile has found, for the first time, an infant planet nestled in spiral arms of dust around a ...

A large sub-Neptune-sized planet revolving around a red dwarf star 124 light years away has been the topic of debate among ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

(Image credit: ESA; CC BY-SA 3.0 IGO) Every planet in our solar system is essentially round. But out in the universe, are there any planets that aren't spherical?

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. Telescopes can see young solar systems being born.

A planetary alignment occurs "when the planets 'line up' on the same side of the sun, generally speaking," Gerard van Belle, Lowell Observatory's director of science, tells Space.com.