NASA’s newly launched IMAP mission is set to tell us more about the boundary between our Solar System and interstellar space ...

After crossing the boundary of the solar system, NASA’s Voyager 1 and 2 spacecraft began detecting changes scientists had ...

Sub-Neptune exoplanets tend to be much closer to their host star than Earth is to the Sun and are thought to have atmospheres made of steam over layers of an exotic phase of water that behaves like ...

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 ...

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 ...