The cause of the climactic transition has been unclear. Now a research team from China finds evidence that atmospheric oxidation led to Mars being cold and bipolar in its early history.
“The Olympic symbol consists of five interlaced rings of equal dimensions (the Olympic rings), used alone, in one or in five different colours. When used in its five-colour version, these colours ...
He isolated it in 1901, and ended the note in which he reported this discovery with “I propose for the new element the name europium, with symbol Eu ... element's most stable oxidation state ...