The moon-forming event: Why it was by explosive ejection rather than a giant impact

One of the oldest unsolved riddles in planetary science concerns the origin of the moon. Over a century ago, George Darwin ...
Morning Overview on MSN

Swarm satellites catch a rare proton surge during a solar storm

A violent solar storm earlier this year did more than paint the polar skies with auroras. It also triggered a sharp, highly ...
Morning Overview on MSN

SpaceX says a Chinese launcher nearly hit a Starlink satellite

SpaceX says one of its Starlink internet satellites came perilously close to being struck by a spacecraft from a Chinese launch, a near miss that highlights how crowded and politically fraught low ...