1.   By the time the Mare impacts occurred there would probably have been too little dust available to fill the Maria.

2.   If this impact had occurred in deep water its traces on the ocean floor might be extremely hard to recognize.

3.   The greatest impact would occur with a major earthquake along the full Hayward Fault.

4.   Thus near misses of comets and asteroids are well documented by modern observations, and grazing impacts also occur.

5.   The initial impact occurs between the outer-arc ridge of the overriding continental margin and promontories on the leading edge of the continent entering the subduction zone.

6.   Other impacts will occur during daylight hours or after Jupiter has set in the Los Angeles sky.

7.   Such a release of energy would be seen on Earth even during daylight, astronomers said, if the impacts occurred on the daylight side of Jupiter.

8.   The cometary impacts have all occurred on the back side of Jupiter, not directly visible from Earth.

9.   Their finding may help astronomers estimate more accurately how often planetary impacts occur.