Planet X has a long and storied history of non-existence. For about 130 years, astronomers have debated the existence of an additional planet or planets to explain discrepancies in the orbits of ...

The planet, which is about twice Jupiter's size, seems to be far too close to its star to survive, so how is it more or less holding together? The answer, according to the researchers, is that the ...

Forbes contributors publish independent expert analyses and insights. Eric Mack is a reporter covering science, sustainability and space. For almost a quarter century, humanity has been staring ...