我们人类到底能不能在火星上定居呢？
Could comets be the source of life on Earth - Justin Dowd
Could human civilization spread across the whole galaxy - Roey Tzezana
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
How to detect a supernova - Samantha Kuula