21. Also if you make your impactor very fast ( and small ) it would bury itself underground. 22. So in theory at least, the hypothetical impactor was a blockbuster about half the diameter of Earth. 23. The rocket-propelled Impactor will separate from a fly-by craft and crash into Tempel 1. 24. In the absence of atmosphere, the impact process begins when the impactor first touches the target surface. 25. The European Union's NEOShield-2 Mission is also primarily studying the Kinetic Impactor mitigation method. 26. Hamacher's result is dependent on the impactor 's density, size, and impact velocity. 27. They estimated the impact occurred about 3.26 billion years ago and that the impactor was approximately wide. 28. Another possibility is that the impactor may have punched through the bright surface to reveal a dark layer beneath. 29. Soil samples retrieved from the Aitken Crater may hold chemical signatures that would help identify the impactor , said Black. 30. As this shock wave expands, it decelerates and compresses the impactor , and it accelerates and compresses the target.
