In a solar system far, far away NASA have discovered a planet which they think 'might be remarkably similar to Earth', though ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Add Yahoo as a preferred source to see more of our stories on Google. Radio telescopes have spotted planet-building pebbles in distant solar systems, shedding new light on how worlds like Earth begin ...

Realising that our solar system isn’t like most others out there has helped astronomers rewrite the story of how it formed ...

LONDON — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper's authors have ...