http://www.economist.com/news/science-and-technology/21580135-cosmic-near-miss-february-has-boosted-research-space-rocks-defenders stopping asteroid strikes: defenders of the earth
Synonyymisanakirja
http://www.economist.com/news/science-and-technology/21580135-cosmic-near-miss-february-has-boosted-research-space-rocks-defenders stopping asteroid strikes: defenders of the earth