a) Expertii spatiali cer sa se ia masuri speciale dupa ce au ajuns la concluzia ca aproximativ 1.000 de asteroizi masivi trec prin apropierea Pamantului cu regularitate, fapt care ar putea cauza o catastrofa globala in orice moment:
“All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.” Arthur Schopenhauer (1788 - 1860)