Impact

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Impact

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1. A single collision of one mass in motion with a second mass which may be either in motion or at rest. </dd>
2. Specifically, the action or event of an object, such as a rocket, striking the surface of a planet or natural satellite, or striking another object; the time of this event, as in from launch to impact. </dd>
3. To strike a surface or an object. </dd>
4. Of a rocket or fallaway section: To collide with a surface or object, as in the rocket impacted 10 minutes after launch. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use