<https://zh-tw.coursera.org/learn/life-on-other-planets#mooc>
<http://schema.org/Description>
"Are we alone? This course introduces core concepts in astronomy, biology, and planetary science that enable the student to speculate scientifically about this profound question and invent their own solar systems.\n\nAll the features of this course are available for free.  It does not offer a certificate upon completion."
<https://zh-tw.coursera.org/lecture/life-on-other-planets/physics-overview-oDTOH?authMode=signup>