我们如何才能观测到超新星的爆发？
Could comets be the source of life on Earth - Justin Dowd
Could human civilization spread across the whole galaxy - Roey Tzezana
Could we actually live on Mars - Mari Foroutan
Free falling in outer space - Matt J. Carlson
How do we study the stars - Yuan-Sen Ting
How small are we in the scale of the universe - Alex Hofeldt