Synopsis by Alice Day
The sun was an object worthy of worship in ancient civilizations, who realized how important it was to their existence. Earth's placement within the solar system makes life possible, while on the other planets, temperature extremes and other conditions create an inhospitable environment for life forms. The energy mechanism of the sun will continue for billions of years, but eventually the sun will die. Practical Guide to the Universe: The Sun - Our Closest Star looks at the processes within the sun, as Tom Selleck, host of the series, provides explanations of the sun's energy.