... These could very well be impact structures, but we don't have the kind of evidence we need to catalogue them yet," said Dr. John McHone, a SIR-C science team member from the University of Arizona, who has studied impact craters for more than 20 years. ...
... The final F-channel image was taken between 2.5 and 5 seconds before impact (altitude about 5 kilometers or 3 miles) and the last P-channel image 0.2 to 0.4 seconds before impact (altitude about 600 meters or 1,970 feet). ...
... The last full-scan transmission occured between 2.5 and 5 seconds before impact, while the last partial-scan picture was taken between 0.2 and 0.4 seconds before impact and achieved resolution to 0.5 meters (1.64 feet). ...
... Ranger 9 . Description . Ranger 9 Impact Television Imaging . ... 9 was designed to achieve a lunar impact trajectory and to transmit high-resolution ... After 64.5 hours of flight, impact occurred in the crater Alphonsus. ...
... Ranger 8 . Description . Ranger 8 Impact Television Imaging . ... 8 was designed to achieve a lunar impact trajectory and to transmit high-resolution ... After 64.9 hours of flight, impact occurred at in Mare Tranquillitatis. ...
... Shoemaker-Levy 9 Impact . Hubble Press Release on the SL-9 Collision Results . ... Comet Tutorial . Comet Shoemaker-Levy 9 Impact from JPL . ... By December 9 1993, the probability of impact for all the large fragments of ...
... 15,000 . land impacts destroy area size of small state; ocean impact produces mild tsunamis . 700 . 10,000 - 100,000 . ... 63,000 . land impacts destroy area size of moderate state (Virginia) ocean impact makes big tsunamis . 1700 . ...