UNIT 12. Earth and Beyond12B: The Threat from Space 우주로부터의 위협It was just after 9 p.m. on June 18, 2004, at an observatory in Arizona, in the United St..
UNIT 10. Earth and Beyond10B: The Threat from Space 우주로부터의 위협IT WAS JUST AFTER 9 P.M. on June 18, 2004, at an observatory in Arizona, U.S.A. David Tho..