NEW : China asks U.S. to provide information so ` ` countries can take precautions '' Pentagon : Most debris will burn up on re - entry within two days . The remaining debris should re - enter the atmosphere within 40 days . We wo n't know for certain for 24 hours whether the tank was hit .
NEW : China asks U.S. to provide information so `` countries can take precautions '' Pentagon : Most debris will burn up on re-entry within two days . The remaining debris should re-enter the atmosphere within 40 days . Pentagon wo n't know for certain for 24 hours whether fuel tank was hit .