The many sides of carbon – Ultra black to climate change

Astronomers have a new way to measure the mass of supermassive black holes

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%

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