Stars have lifespans, and our star is half over. Five billion of our sun’s allotted 10 billion years have passed. We have five billion to go. But long before that, we’ll be toast. In a debated one-to-four-billion years the sun will expand and lap the shores of Earth. Tetélestai.
Priscilla Long describes fusion, the Sun, and the possibility of life elsewhere in the Universe. Read.
(Photo via Boston. TRACE Project, Stanford-Lockheed Institute for Space Research, NASA)