Scientists have unearthed an "interstellar tunnel" linking our Solar System to far-off stars, suggesting it could be part of a vast network of cosmic tunnels akin to a gigantic subway system. The ...

Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an orbit stretching 25,000 years and a size that may qualify it as a dwarf ...

The European Space Agency-led Solar Orbiter mission has split the flood of energetic particles flung out into space from the sun into two groups, tracing each back to a different kind of outburst from ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new simulations show. By Katherine Kornei If our species manages to hang on ...

A Chinese spacecraft built to collect specimens from an unexplored asteroid and return them to Earth successfully launched Wednesday from a military-run spaceport in the country’s mountainous interior ...

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 ...

An exoplanetary system about 116 light-years from Earth could flip the script on how planets form, according to researchers who discovered it using telescopes from NASA and the European Space Agency, ...