A spoonful of neutron star material would be incredibly dense and have bizarre effects on Earth. White House announces ...

Neutron star mergers are collisions between neutron stars, the collapsed cores of what were once massive supergiant stars.

A herd of African elephants instinctively formed an "alert circle" to protect the younger elephants at the San Diego Zoo Safari Park as a 5.2-magnitude earthquake shook Southern California on Monday.