Astronomers studying a dim red dwarf star called LHS 1903 have found a four-planet system with an architecture that defies the standard rules of how rocky worlds take shape. The outermost planet in ...

Astronomers have long believed that planetary systems follow a familiar blueprint. Small rocky planets ...

Astronomers have discovered a brand-new type of planet outside our solar system that, even in its infancy, is already bigger than Jupiter. What's more, the find represents the first clear detection of ...

Add Yahoo as a preferred source to see more of our stories on Google. The unexpected detection of a new planet has been hailed as a “remarkable discovery” by Irish astronomers who were involved in its ...

The discovery overturns traditional models that predicted gas giants in outer orbits and suggests planets can form in gas-poor environments.

The science community may be ecstatic over the discovery of a ninth planet, but the former planet "Pluto" had a totally different reaction. Hours after scientists announced there's solid evidence of ...