John Herschel Glenn passed away recently at age 95. He was the first American to orbit the Earth, on board Friendship 7 in February 1962, and before that, a much decorated war veteran, serving as a fighter pilot in both World War II and in Korea, finally retiring as a colonel in 1965. As if that wasn’t enough, after leaving NASA, he won a US Senate seat, representing his home state of Ohio, and served for 25 years.
The Earth we live on was formed from a cloud of dust and ice, heated by a massive ball of compressed hydrogen that was the early Sun. Somewhere along the four billion year journey to where we are today, our planet acquired life, and some of that became us. Our modern brains ask how it all came together and progressed, and what shaped the pathways it followed.