Our Sun’s outer atmosphere, the corona, is millions of degrees hotter than it should be, and no one knows why.

This logic puzzle looks simple at first, but quickly becomes challenging. Solving it requires a solid understanding of how ...

A rare discovery beyond Neptune is forcing scientists to rethink early solar system dynamics and the forces that shaped ...

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 ...

In humanity’s millennia of staring at the stars and decades of launching probes to explore our universe, only two spacecraft carrying working instruments have ever managed to escape the bubble of ...