| retardation point | has duration zero (it is a point in time) |  |
| does not occur for meteoroids heavier than 10 tons they impact with a significant fraction of their cosmic velocity |  |
| has altitude inversely proportional to the mass of the meteoroid |  |
| has start time shortly after the time of initial contact with atmosphere but before impact |  |
| has definition the point in the flight of a meteoroid through the atmosphere where it loses its cosmic velocity and falls freely due to gravity |  |
| is a kind of meteor event |  |
| impact event | can produce a crater |  |
| event | has synonym world point |  |
| has time of occurrence |  |