Father Langan's research and writing widely explored the just-war theory and its application to questions surrounding issues such as nuclear armaments, terrorism, the U.S.-led war in Iraq, and the Syrian civil war.

Thomas Merton wrote an introduction to a lyrical book of reflections by Cardenal, Vida en Amor: “In a time of conflict, anxiety, war, cruelty, and confusion, the reader may be surprised that this book is a hymn in praise of love, telling us that ‘all things love one another.’”

Father Ernesto Cardenal, the Nicaraguan poet and revolutionary whose political work earned him a public admonishment from St. John Paul II, died March 1 in the Nicaraguan capital of Managua. He was 95.

I could list all his scientific work, his writings on faith and science, his honors and degrees. But none of those are George.

Jesuit Brother Guy Consolmagno, the Vatican Observatory's current director, recalled the first words from Father Coyne when he joined the observatory staff in 1993: "Do good science."

Msgr. Frank Del Prete, pastor of St. Gabriel the Archangel Parish in Saddle River, New Jersey, remembers Higgins Clark not only as a talented writer but also as a lively, committed parishioner.