＂All stars have a finite life expectancy-even our own sun. Fortunately, many stars survive for billions of years. Our sun has existed for more than 4 billion years and has not yet reached the next phase of its life cycle. While it is inevitable that the sun will burn out, it will not be within the lifetime of anyone alive today. Through accessible main text, enhanced with vivid full-color photographs and informative graphic organizers, explores the science behind the sun and what humanity can do to mitigate the damage of this star’s eventual death＂--
$ 692 元
原價 692