Striking bull's-eye-shaped clouds form above erupting La Palma volcano

Climate: These countries are historically responsible for climate change- The U.S. was found to have released 509 gigatons of CO2 since 1850, representing some 20% of the global total. China was found to be a relatively distant second with 11%

What’s Behind California’s Dramatic Surge of Large Fires?

Readers discuss Pluto’s planetary status, balding black holes and more